How Old And What House Number

Tom is from the census bureau and greets Mary at her door. The have the following conversation: 

Tom: I need to know how old your three kids are.

Mary: The product of their ages is 36.

Tom: I still don't know their ages.

Mary: The sum of their ages is the same as my house number.

Tom: I still don't know their ages.

Mary: The younger two are twins.

Tom: Now I know their ages! Thanks!

How old are Mary's kids and what is Mary's house number? (Yes, there is enough information here to solve the problem!)