Andrew and I are adults now.
We have been sleeping on a futon since we got married. Not the biggest (it's only a full) or most comfortable bed to sleep on, but it worked. He had it when we got married; had been using it as a bed for himself. I only had a twin bed and we didn't have the extra money hanging around to buy a new bed at the time.
We had planned to look for one this summer or fall. However, some friends of ours just got a new bed and offered their old one to us. We gladly excepted! We gave our sleeper sofa to Andrew sister and put our futon in the living room. (Someday we will get a new couch too!)
This is our new queen bed. It is much taller than we are used to. I almost have to jump to get into bed! The headboard looks black in this picture, but it is actually a dark brown with a touch of a distressed look.
It took us a while, but in our early thirties we finally have an adult bed!