diff --git a/backend/src/routes/schedules/index.js b/backend/src/routes/schedules/index.js
index 7af35e1..36fa758 100644
--- a/backend/src/routes/schedules/index.js
+++ b/backend/src/routes/schedules/index.js
@@ -327,6 +327,11 @@ async function handleMonthlySchedules(db, year, month) {
   // 생일 일정 추가
   for (const member of birthdays) {
     const birthDate = new Date(member.birth_date);
+    const birthYear = birthDate.getFullYear();
+
+    // 조회 연도가 생년보다 이전이면 스킵
+    if (year < birthYear) continue;
+
     const birthdayThisYear = new Date(year, birthDate.getMonth(), birthDate.getDate());
     const dateKey = birthdayThisYear.toISOString().split('T')[0];
 
diff --git a/frontend/src/components/admin/CustomDatePicker.jsx b/frontend/src/components/admin/CustomDatePicker.jsx
index 98abb0c..e4524b7 100644
--- a/frontend/src/components/admin/CustomDatePicker.jsx
+++ b/frontend/src/components/admin/CustomDatePicker.jsx
@@ -40,13 +40,15 @@ function CustomDatePicker({ value, onChange, placeholder = '날짜 선택', show
         days.push(i);
     }
 
-    const startYear = Math.floor(year / 10) * 10 - 1;
+    const MIN_YEAR = 2025;
+    const startYear = Math.max(MIN_YEAR, Math.floor(year / 12) * 12 - 1);
     const years = Array.from({ length: 12 }, (_, i) => startYear + i);
+    const canGoPrevYearRange = startYear > MIN_YEAR;
 
     const prevMonth = () => setViewDate(new Date(year, month - 1, 1));
     const nextMonth = () => setViewDate(new Date(year, month + 1, 1));
-    const prevYearRange = () => setViewDate(new Date(year - 10, month, 1));
-    const nextYearRange = () => setViewDate(new Date(year + 10, month, 1));
+    const prevYearRange = () => canGoPrevYearRange && setViewDate(new Date(Math.max(MIN_YEAR, year - 12), month, 1));
+    const nextYearRange = () => setViewDate(new Date(year + 12, month, 1));
 
     const selectDate = (day) => {
         const dateStr = `${year}-${String(month + 1).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
@@ -57,7 +59,6 @@ function CustomDatePicker({ value, onChange, placeholder = '날짜 선택', show
 
     const selectYear = (y) => {
         setViewDate(new Date(y, month, 1));
-        setViewMode('months');
     };
 
     const selectMonth = (m) => {
@@ -124,7 +125,8 @@ function CustomDatePicker({ value, onChange, placeholder = '날짜 선택', show
                             <button
                                 type="button"
                                 onClick={viewMode === 'years' ? prevYearRange : prevMonth}
-                                className="p-1.5 hover:bg-gray-100 rounded-lg transition-colors"
+                                disabled={viewMode === 'years' && !canGoPrevYearRange}
+                                className={`p-1.5 rounded-lg transition-colors ${viewMode === 'years' && !canGoPrevYearRange ? 'opacity-30' : 'hover:bg-gray-100'}`}
                             >
                                 <ChevronLeft size={20} className="text-gray-600" />
                             </button>
diff --git a/frontend/src/pages/mobile/public/Schedule.jsx b/frontend/src/pages/mobile/public/Schedule.jsx
index fc55c09..09e9d3c 100644
--- a/frontend/src/pages/mobile/public/Schedule.jsx
+++ b/frontend/src/pages/mobile/public/Schedule.jsx
@@ -1239,8 +1239,10 @@ function CalendarPicker({
         }
     };
     
-    const [yearRangeStart, setYearRangeStart] = useState(Math.floor(year / 12) * 12);
+    const MIN_YEAR = 2025;
+    const [yearRangeStart, setYearRangeStart] = useState(MIN_YEAR);
     const yearRange = Array.from({ length: 12 }, (_, i) => yearRangeStart + i);
+    const canGoPrevYearRange = yearRangeStart > MIN_YEAR;
     
     // 배경 스크롤 막기
     useEffect(() => {
@@ -1364,16 +1366,17 @@ function CalendarPicker({
                     >
                         {/* 년도 범위 헤더 */}
                         <div className="flex items-center justify-between mb-3">
-                            <button 
-                                onClick={() => setYearRangeStart(yearRangeStart - 12)}
-                                className="p-1"
+                            <button
+                                onClick={() => canGoPrevYearRange && setYearRangeStart(Math.max(MIN_YEAR, yearRangeStart - 12))}
+                                disabled={!canGoPrevYearRange}
+                                className={`p-1 ${canGoPrevYearRange ? '' : 'opacity-30'}`}
                             >
                                 <ChevronLeft size={18} />
                             </button>
                             <span className="font-semibold text-sm">
                                 {yearRangeStart} - {yearRangeStart + 11}
                             </span>
-                            <button 
+                            <button
                                 onClick={() => setYearRangeStart(yearRangeStart + 12)}
                                 className="p-1"
                             >
diff --git a/frontend/src/pages/pc/admin/AdminSchedule.jsx b/frontend/src/pages/pc/admin/AdminSchedule.jsx
index c64f7c6..3b60683 100644
--- a/frontend/src/pages/pc/admin/AdminSchedule.jsx
+++ b/frontend/src/pages/pc/admin/AdminSchedule.jsx
@@ -273,9 +273,11 @@ function AdminSchedule() {
     const days = ['일', '월', '화', '수', '목', '금', '토'];
     const monthNames = ['1월', '2월', '3월', '4월', '5월', '6월', '7월', '8월', '9월', '10월', '11월', '12월'];
     
-    // 년도 범위 (현재 년도 기준 10년 단위 - Schedule.jsx와 동일)
-    const startYear = Math.floor(year / 10) * 10 - 1;
+    // 년도 범위 (2025년부터 시작, 12년 단위)
+    const MIN_YEAR = 2025;
+    const startYear = Math.max(MIN_YEAR, Math.floor(year / 12) * 12 - 1);
     const yearRange = Array.from({ length: 12 }, (_, i) => startYear + i);
+    const canGoPrevYearRange = startYear > MIN_YEAR;
     
     // 현재 년도/월 확인 함수
     const isCurrentYear = (y) => new Date().getFullYear() === y;
@@ -482,14 +484,13 @@ function AdminSchedule() {
         setSchedules([]); // 이전 달 데이터 즉시 초기화
     };
 
-    // 년도 범위 이동
-    const prevYearRange = () => setCurrentDate(new Date(year - 10, month, 1));
-    const nextYearRange = () => setCurrentDate(new Date(year + 10, month, 1));
+    // 년도 범위 이동 (12년 단위, 2025년 이전 불가)
+    const prevYearRange = () => canGoPrevYearRange && setCurrentDate(new Date(Math.max(MIN_YEAR, year - 12), month, 1));
+    const nextYearRange = () => setCurrentDate(new Date(year + 12, month, 1));
 
-    // 년도 선택 시 월 선택 모드로 전환
+    // 년도 선택
     const selectYear = (newYear) => {
         setCurrentDate(new Date(newYear, month, 1));
-        setViewMode('months');
     };
 
     // 월 선택 시 적용 후 닫기
@@ -730,7 +731,8 @@ function AdminSchedule() {
                                         <div className="flex items-center justify-between mb-4">
                                             <button
                                                 onClick={prevYearRange}
-                                                className="p-1.5 hover:bg-gray-100 rounded-lg transition-colors"
+                                                disabled={!canGoPrevYearRange}
+                                                className={`p-1.5 rounded-lg transition-colors ${canGoPrevYearRange ? 'hover:bg-gray-100' : 'opacity-30'}`}
                                             >
                                                 <ChevronLeft size={20} className="text-gray-600" />
                                             </button>
diff --git a/frontend/src/pages/pc/admin/AdminScheduleDict.jsx b/frontend/src/pages/pc/admin/AdminScheduleDict.jsx
index 5338ea9..19e9242 100644
--- a/frontend/src/pages/pc/admin/AdminScheduleDict.jsx
+++ b/frontend/src/pages/pc/admin/AdminScheduleDict.jsx
@@ -613,7 +613,7 @@ function AdminScheduleDict() {
                     ) : (
                         <div className="overflow-x-auto max-h-[500px] overflow-y-auto">
                             <table className="w-full">
-                                <thead className="bg-gray-50 sticky top-0">
+                                <thead className="bg-gray-50 sticky top-0 z-30">
                                     <tr>
                                         <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider w-16">#</th>
                                         <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">단어</th>
diff --git a/frontend/src/pages/pc/admin/schedule/form/index.jsx b/frontend/src/pages/pc/admin/schedule/form/index.jsx
index 133fa5f..07bd1b4 100644
--- a/frontend/src/pages/pc/admin/schedule/form/index.jsx
+++ b/frontend/src/pages/pc/admin/schedule/form/index.jsx
@@ -34,7 +34,7 @@ const formVariants = {
   visible: {
     opacity: 1,
     y: 0,
-    transition: { duration: 0.3, ease: "easeOut" },
+    transition: { duration: 0.3, ease: "easeOut", delay: 0.3 },
   },
   exit: {
     opacity: 0,
diff --git a/frontend/src/pages/pc/public/Schedule.jsx b/frontend/src/pages/pc/public/Schedule.jsx
index 3247360..30ccfa4 100644
--- a/frontend/src/pages/pc/public/Schedule.jsx
+++ b/frontend/src/pages/pc/public/Schedule.jsx
@@ -431,7 +431,6 @@ function Schedule() {
 
     const selectYear = (newYear) => {
         setCurrentDate(new Date(newYear, month, 1));
-        setViewMode('months');
     };
 
     const selectMonth = (newMonth) => {
@@ -568,12 +567,14 @@ function Schedule() {
         return year === now.getFullYear() && m === now.getMonth();
     };
 
-    // 연도 선택 범위
-    const [yearRangeStart, setYearRangeStart] = useState(currentYear - 1);
+    // 연도 선택 범위 (2025년부터 시작)
+    const MIN_YEAR = 2025;
+    const [yearRangeStart, setYearRangeStart] = useState(MIN_YEAR);
     const yearRange = Array.from({ length: 12 }, (_, i) => yearRangeStart + i);
     const monthNames = ['1월', '2월', '3월', '4월', '5월', '6월', '7월', '8월', '9월', '10월', '11월', '12월'];
-    const prevYearRange = () => setYearRangeStart(prev => prev - 3);
-    const nextYearRange = () => setYearRangeStart(prev => prev + 3);
+    const canGoPrevYearRange = yearRangeStart > MIN_YEAR;
+    const prevYearRange = () => canGoPrevYearRange && setYearRangeStart(prev => Math.max(MIN_YEAR, prev - 12));
+    const nextYearRange = () => setYearRangeStart(prev => prev + 12);
 
     // 선택된 카테고리 이름
     const getSelectedCategoryNames = () => {
@@ -680,7 +681,7 @@ function Schedule() {
                                         className="absolute top-20 left-8 right-8 mx-auto w-80 bg-white rounded-xl shadow-lg border border-gray-200 p-4 z-10"
                                     >
                                         <div className="flex items-center justify-between mb-4">
-                                            <button onClick={prevYearRange} className="p-1.5 hover:bg-gray-100 rounded-lg transition-colors">
+                                            <button onClick={prevYearRange} disabled={!canGoPrevYearRange} className={`p-1.5 rounded-lg transition-colors ${canGoPrevYearRange ? 'hover:bg-gray-100' : 'opacity-30'}`}>
                                                 <ChevronLeft size={20} className="text-gray-600" />
                                             </button>
                                             <span className="font-medium text-gray-900">