diff --git a/components/TimeHeader.vue b/components/TimeHeader.vue
index 66b31a5..1390e75 100644
--- a/components/TimeHeader.vue
+++ b/components/TimeHeader.vue
@@ -4,7 +4,8 @@
     :class="colorClasses"
   >
     <div class="text-center pt-2 pb-1 border-r border-gray-600 select-none">
-      {{ $store.getters.gameMonth }} {{ $store.state.gameDate.year }}
+      {{ $store.getters.gameMonth }}
+      {{ Math.floor($store.state.gameDate / 12) }}
     </div>
 
     <div
@@ -12,8 +13,8 @@
     >
       <progress
         class="absolute top-0 left-0 right-0 h-1 w-full"
-        :max="maxAgeValue"
-        :value="ageValue"
+        :max="$store.state.playerAgeMax"
+        :value="$store.state.playerAge"
       />
       {{ ageText }}
     </div>
@@ -26,25 +27,17 @@
 export default {
   computed: {
     ageText() {
-      const { year, month } = this.$store.state.playerAge
+      const year = Math.floor(this.$store.state.playerAge / 12)
+      const month = this.$store.state.playerAge % 12
 
-      return `${year}y${month}m max`
-    },
-    ageValue() {
-      const { year, month } = this.$store.state.playerAge
-
-      return year * 12 + month
+      return `${year}y${month}m`
     },
     maxAgeText() {
-      const { year, month } = this.$store.state.playerAgeMax
+      const year = Math.floor(this.$store.state.playerAgeMax / 12)
+      const month = this.$store.state.playerAgeMax % 12
 
       return `${year}y${month}m max`
     },
-    maxAgeValue() {
-      const { year, month } = this.$store.state.playerAgeMax
-
-      return year * 12 + month
-    },
     colorClasses() {
       const { lightColor, darkColor } = this.$store.getters.activeTab
 
diff --git a/store/index.js b/store/index.js
index 3c85faa..2db9c33 100644
--- a/store/index.js
+++ b/store/index.js
@@ -150,22 +150,10 @@ export const state = () => ({
       complete: false,
     },
   ],
-  gameDate: {
-    month: 12,
-    year: 1990,
-  },
-  playerAge: {
-    month: 0,
-    year: 34,
-  },
-  playerAgeMax: {
-    month: 0,
-    year: 80,
-  },
-  playerLivedTotal: {
-    month: 0,
-    year: 0,
-  },
+  gameDate: 1991 * 12,
+  playerAge: 34 * 12,
+  playerAgeMax: 80 * 12,
+  playerLivedTotal: 0,
   wisdomGained: 0, // wisdom gained so far on this run, not applied until player sends the book.
   wisdomApplied: 0, // wisdom from previous runs
   totalLifetimes: 1,
@@ -197,7 +185,10 @@ export const getters = {
       10: 'Oct.',
       11: 'Nov.',
       12: 'Dec.',
-    }[state.gameDate.month]
+    }[(state.gameDate % 12) + 1]
+  },
+  gameYear: (state) => {
+    return Math.floor(state.gameDate / 12)
   },
   currencySpent: (state) => {
     return Decimal.subtract(state.currencyTotal, state.currency)
@@ -243,29 +234,11 @@ export const mutations = {
     )
   },
   tickGameDate: (state) => {
-    let gameYear = state.gameDate.year
-    let gameMonth = state.gameDate.month + 1
-    // Intentional: Months are 1 through 12, ages are 0 through 11.
-    if (gameMonth > 12) {
-      gameMonth = 1
-      gameYear = gameYear + 1
-    }
-    let ageYear = state.playerAge.year
-    let ageMonth = state.playerAge.month + 1
-    let wisdomGained = 0
-    if (ageMonth >= 12) {
-      ageMonth = 0
-      ageYear = ageYear + 1
-      wisdomGained += 1
-    }
-    Vue.set(state.gameDate, 'year', gameYear)
-    Vue.set(state.gameDate, 'month', gameMonth)
-    Vue.set(state.playerAge, 'year', ageYear)
-    Vue.set(state.playerAge, 'month', ageMonth)
-    state.wisdomGained = state.wisdomGained + wisdomGained
+    state.gameDate += 1
+    state.playerAge += 1
+    if (!(state.playerAge % 12)) state.wisdomGained++
   },
-  travelGameDate: (state, { month, year }) => {
-    Vue.set(state.gameDate, 'month', month)
-    Vue.set(state.gameDate, 'year', year)
+  travelGameDate: (state, month) => {
+    state.gameDate = month
   },
 }