diff --git a/solutions/typescript/space-age/1/space-age.ts b/solutions/typescript/space-age/1/space-age.ts
new file mode 100644
index 0000000..17232aa
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+++ b/solutions/typescript/space-age/1/space-age.ts
@@ -0,0 +1,28 @@
+type Planets =
+	| "mercury"
+	| "venus"
+	| "earth"
+	| "mars"
+	| "jupiter"
+	| "saturn"
+	| "uranus"
+	| "neptune";
+
+type EarthYears = {
+	[Key in Planets]: number;
+};
+
+const earthYears: EarthYears = {
+	mercury: 0.2408467,
+	venus: 0.61519726,
+	earth: 1.0,
+	mars: 1.8808158,
+	jupiter: 11.862615,
+	saturn: 29.447498,
+	uranus: 84.016846,
+	neptune: 164.79132,
+};
+
+export function age(planet: Planets, seconds: number): number {
+	return +(seconds / (earthYears[planet] * 31_557_600)).toFixed(2);
+}