還暦
かんれき · kanreki · JLPT N1 · noun
birthday
🎂 還 = return + 暦 = calendar: at 60, your zodiac cycle comes back to its starting point
The 60-year cycle pairs 12 animal signs with 5 elements, so at 60 your birth year's sign returns. Kanreki literally means the calendar returns to where it began.