What is the minimum age where two kids can share a room?

I have two girls born 13 months apart. DD1 is 17 months old. DD2 is 4 months old. DD2 is currently in our room (in her own crib) and will stay there until she is a year old. Our original plan was for the girls to have separate rooms...but to make a long story short, they will be sharing a room (the only reason I'm not sharing why is it would take away from/complicate my post).I'd also like to add that DD1 is a fantastic sleeper. While we are still in the process of sleep training DD2, it's looking like she'll be a good sleeper as well.But I still find myself wondering if it's 'ok' for a 1 year old and 2 year old to share a room? They will both still be in cribs, they both sleep pretty well? But is there something I'm missing? Should we be keeping DD2 in our room a little longer? Any opinions/advice would be appreciated :) via /r/Parenting https://ift.tt/2MGUGCZ