Hey, folks! You have to realize that in the IT world, three years is OLD for any kind of computer, whether a laptop or a desktop. If you're still getting good use out of one after that point, you're WAY ahead of the game.
As for me, my desktop is a 3 year-old iMac, with a 1 yo MacBook, and DW has a 1.5 yo MacBook Pro. We also have a 1 yo Mac Mini that runs the security system. We're probably good for about another year, when the iMac will most likely get replaced with a new one.
Since I bought my first Apple computer in 1980, my first Mac in 1987, used to run the tech support for a Mac software developer, and did some consulting for Apple many years ago, I'm kind of a [-]nerd[/-] guru in the Apple area. I can do Windows, Unix, Linux, and a few other operating systems, but I always gravitate toward Apple.