Kids sharing room

At what age did you move the baby in with your toddler? My daughter is 3, my son will be one at the end of the month. He sleeps in my room (in his own bed) and my daughter has her own room. My son usually goes to bed a bit before her. I want to get him out of my room soon, into hers. I hate having to be so quiet in my own bedroom. Thing is, she lays in her bed and sings, and talks til she falls asleep. I'm afraid I put them in a room together they will not go to sleep... Any tips? Stories?

I moved my almost 10 month old into his brothers room a couple weeks ago. He sleeps better in there! His older brother is 5, though and is very good at keeping quiet when baby is sleeping.