Ask Mar­i­lyn

Chattanooga Times Free Press - Parade - - Personality - By Mar­i­lyn vos Sa­vant Send ques­tions to mar­i­lyn@ pa­rade.com

The last two dig­its of my birth year are the same as my age to­day. Can you state with 100 per­cent cer­tainty how old I am?

—Thomas Maxwell, West Palm Beach, Fla. Read­ers, here’s how to solve this fun prob­lem. Say you were born in 1980. You would be 80 years old in 2060, so that’s when the last two dig­its of your birth year would match your age. So how old is Thomas now? The last two dig­its of the year of any­one’s birth range from 00 to 99. Dou­bling only two of those num­bers (9 and 59) results in the last two dig­its of the year now (the 18 in 2018). Thomas isn’t 9 years old (born in 2009) be­cause his age has two dig­its. So he must be 59 years old (born in 1959).

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