AppleBonker
Dag, yo!
Computers have way more than two or three year life spans. At least double that.
Yup. Sounds like it's time for a format and fresh install. I used to try to do that about every 3 months, but home ownership has put a cramp in those plans.
Laptop batteries may start to perform poorly after that timeframe, however (depending on usage).
Fantastic reference.