Quote Originally Posted by Dusty Chalk
Yup, occasionally the capacitors will dry out and the surrounds will crack, other than that, they should last for a good long while, well over 20 years. You shouldn't have any problem getting a lot more mileage out of 5 year olds.
replaceable bits!

If you don't do anything stupid to them they'll last quite a while. Most things that go wrong can be replaced.