From Longman Dictionary of Contemporary Englishripe old ageripe old ageOLD/NOT YOUNG a) if you live to a ripe old age, you are very old when you die Eat less and exercise more if you want to live to a ripe old age. b) used to show that you find it surprising or impressive that someone is doing something or has achieved something at a very young age – used humorously She was put in charge at the ripe old age of twenty-nine. → ripe
Examples from the Corpus
at the ripe old age of• Ex-wife Alana demonstrates that she's still out in front in the glamour stakes at the ripe old age of 43. 