guides

Short reads on what your age looks like once you measure it in days, weeks and seconds — and why the number keeps feeling faster. Sourced where research exists, marked as exploratory where it doesn't. Read them in any order, or start with the calculator.

Measuring time — 4

01How many days old am I?5 min 02How many seconds have I been alive?5 min 03What day of the week was I born?4 min 04Age milestones worth marking6 min

Time & perception — 4

05Why time speeds up with age8 min 06What is aging? The science explained7 min 07Biological age vs chronological age8 min 08Why 40-year-olds are younger than ever7 min

The body over time — 4

09How age affects sleep9 min 10How age affects memory7 min 11How age affects your metabolism7 min 12How exercise needs change as you age7 min

People & perspective — 5

13How young people see old people6 min 14How old people see young people6 min 15What old people regret most7 min 16How to live without regrets7 min 17Age gap in relationships: what the research says6 min

Work, money & society — 4

18Age and productivity: debunking the myths7 min 19The truth about retiring in America8 min 20Age and investing: a decade-by-decade guide7 min 21New York population: growing or shrinking?8 min

Records & the world — 5

22Life expectancy by country: global rankings7 min 23The oldest people in history9 min 24How different cultures view aging6 min 25The average age of first-time parents5 min 26Famous late bloomers who succeeded after 406 min