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).