Hi Mama M,
You’re most welcome.
Without knowing the specifications of any particular mattress, I couldn’t provide any meaningful commentary on the products for you (manufacturers will commonly make a wide range of products of varying levels of quality). You would need to find out the information listed here of any mattress you were considering so you could compare the quality of the materials and components to the durability guidelines here to make sure there were no lower quality materials or weak links in a mattress that would be a cause for concern relative to the durability and useful life of a mattress before making any purchase.
The steps for shopping for a mattress are outlined here in the mattress shopping tutorial. If you do visit a store and find a product you like, feel free to post back here with the specifications and I’ll be happy to comment upon them for you.
Phoenix