Three Daughters

Puzzle: A man in my neighborhood has three daughters. One day when I asked their ages he said, “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 clue, “My eldest daughter lives upstairs.”

Finally I was able to figure out their ages. How old are they?

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