"*The product of their ages is 36*".

When I still couldn't find their ages he said:

"*Ok. I'll give you another clue: the sum of their ages is same as the number of my house*".

I knew the number but still couldn't calculate their ages. So the man gave me a last hint, he said:

"*My eldest daughter lives upstairs*".

Finally I was able to find their ages. Can you?