Most of the newer model reels will last a lifetime if taken care of properly, but like anything we use on a regular basis, they will occasionally need a little TLC to ensure it casts and retrieves properly every time. Does your reel make a funny sound when casting? Does it seem like you can't cast as far as when the reel was new? Does your line bunch up on one side of the spool? These problems and others can be solved with a little reel maintenance. The two .pdf files below are from Shimano, but most of the maintenance and procedures can be applied to any manufacturer's reel.
Fishing Wednesdays, not weekends.