I thought this should be fairly easy and I hope I am posting in the proper forum but my brain is on vacation today and I am having a little trouble. Help please?

Two men walk in the street. While the conversation, the first asks the second the age of his three daughters. The second answers like this :

FIRST : The product of their ages gives 36.

SECOND : Huh… I can’t find their ages!

FIRST : The sum of their ages gives the number of this house’s door.

SECOND : I still can’t find their ages…

FIRST : The elder has blond hair.

SECOND : Oh, now I see.

What are the ages of the three daughters?

oh I forgot to mention this was also on the paper we got... hmmm maybe its more difficult than I thought and could be why I am having so much trouble coming up with the answer!

Good luck and get your friends here and try to answer! The only hint I can give is that no computer in the world is currently able to solve this problem on itself