My boys are 16 & 12 in foster care at what age do they stop sharing a bedroom please?

I don't think it makes any difference for boys sharing a bedroom. Of course, it is an issue if is brother and sister. There are boys dorms in private schools, so I see no difference in a case like this.

Tick

Yep they can share a room. Age doesn't matter. Child Protective Services and other organizations say
Up to 2 of the same sex can share a room.
Now if the older one wants his own room you may have a problem if you have limited space.

I work for the Social Service Office. If I went on a home inspection and saw two boys sharing a room, I wouldn't think twice about it.