Two old friends, Jacky and Bob, meet after a long time.
Jacky: Hey, how are you man?
Bob: Not bad, got married and I have three kids now.
Jacky: That’s awesome. How old are they?
Bob: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jacky: Cool… But I still don’t know.
Bob: My eldest kid just started taking piano lessons.
Jacky: Oh now I get it.
How old are Bob’s kids?