It's easy to tell when your mattress just doesn't support you like it used to - you might find yourself tossing and turning more than usual, waking up with aches and pains, or just not sleeping at all! If you've had your mattress for more than seven years, chances are good it's not supporting you like it used to. Chances are also good that your body has changed - it's asking for support in places it didn't need support before. Either way, investing in a new mattress is a smart decision. Take your time, do the research and ask your friends! Real life feedback from people you know and trust is usually the best endorsement for a mattress. Listen to everyone's opinion, but don't forget, a mattress is not a 'one size fits all' purchase, ultimately you have to decide what is best for your body and your sleep type.
Once you do find the mattress of your dreams it's important to keep in mind that it's going to take time for your body to adjust. You've been sleeping on a mattress with poor support for a while, and your body will need a minute to remember what it's like to have good support again. It can take anywhere from 10 days to 6 weeks for your body to adjust, but once it does -- I promise you -- you'll wonder why you ever waited so long to get a new mattress!