Son's Ages (Solve & Win)

Two old MIT grads met at fairway on the upper West side, they haven't seen each other in over 20 years. Here's the chat between them :

The first grad says to the second: “how have you been?”
Second: “great! i got married and i have three children now”
First: “really? how old are they?”
Second: “well, the product of their ages is 72, and the sum of their ages is the same as the number on that building over there..”
First: “right, ok.. oh wait.. hmm, i still don’t know”
Second: “oh sorry, the oldest one just started to play the cricket”
First: “wonderful! my oldest is the same age!”

How old are the children ?

Comment your answer in ascending order of the (age) children and make sure you explain it a bit so others can understand.

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