She’s 100 Years Old, But Officially Not a Day Over 24

GRESHAM, Ore. — Irene Olsen turned 100 on Saturday--but the number is approximate since it was only her 24th official birthday.

Olsen was born in a leap year, on Feb. 29, 1892. Saturday would have been her 25th official birthday except, she said: “There was an eight-year period at the turn of the century when we did not have leap year. So 24 it is.”

Years ending in double zero must be divisible by 400 to be leap years. That ruled out 1900.

Asked for the obligatory tip for longevity, she said: “No drinking, no smoking, and I love to dance.”