My teen' mattress was getting quite old. I think it was 10 years old or maybe older as we had received it from a friend. To make my teen' mattress comfortable, we bought an egg crate mattress topper. The egg crate topper made it a bit more comfortable. I really was not looking to replacing the teen' mattress as he was going off to college in a year so I did not feel a need. His old mattress is training for those uncomfortable college dorm mattresses that he will be soon sleeping on. Read more at Mom Knows Best.