set minimum birthday to 13 years ago (#7808)

src/lib/strings/time.ts

@@ -19,6 +19,17 @@ export function getAge(birthDate: Date): number {
   return age
 }
 
+/**
+ * Get a Date object that is N years ago from now
+ * @param years number of years
+ * @returns Date object
+ */
+export function getDateAgo(years: number): Date {
+  const date = new Date()
+  date.setFullYear(date.getFullYear() - years)
+  return date
+}
+
 /**
  * Compares two dates by year, month, and day only
  */