Brainteaser #36- Age Of Children -

Two mathematicians, Albert and Isaac, are walking down the street. It's not long before the conversation turns to puzzles. Albert says that he has three grandchildren and that the product of their three ages is 36. He adds that the sum of the three ages is equal to the address of the house in front of them. Isaac thinks it over and says he needs another clue. Albert says that the youngest two children occasionally wear the old clothes of the eldest child.

What are the ages of the 3 grandchildren?