Schlage locks are top of the line so you should be just fine with the 10 year old locks, however you will have to use your own judgement. There is no way for a locksmith to know the condition of your locks without seeing them first hand, but here are a few quick tests you can do to spot any potential problems.
1) Turn the knob completely on both sides of the lock and make sure the handles spring back smoothly.
2) When turning the knob, make sure the lock retracts fully when you turn it.
3) Make sure the lock actually locks and unlocks
If you are unsure if you should purchase new locks, give us a call or stop by our lock shop in Malvern and one of our expert locksmiths will help you determine if you need new locks or can continue to use your old locks.