Half of an 80-year lifespan is your 40th birthday. Globally, the average midpoint is about 36.5. Either way, it lands earlier than people expect.
Use the "how old will I be" calculator to find the date you turn half your expected age. Or measure in days: ≈14,500 days for an 80-year life. The age-in-days calculator shows your current count live.
Halfway points rarely fall on round birthdays. The milestones page surfaces the markers nobody else will mark for you.
Seconds in a lifetime · Days you've lived · Your age in real units · Why age changes
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