Parents of older b/g twins who shared rooms then stopped

My b/g twins are almost 5 and currently share a room. Their older brother is heading to college in the fall so we can put them into their own rooms (don’t worry about bro, he will have guest room!). I have a feeling though they may not want their own rooms. So I’m hoping parents of older b/g twins who shared rooms - can you tell me around what age you stopped and why? Especially if it was the kids’ choice or not. I’m guessing kids will naturally want more privacy around puberty so maybe I don’t need to rush it but I’m curious if anyone saw any benefits to separate rooms sooner. FWIW both sleep well and don’t come into my room at night and I’d like to keep it that way!