If you want the most up-to-date machine, then no, you shouldn't. Older laptops run a greater risk of being made obsolete by Apple's yearly macOS operating system upgrades. If you want to save some money, however, then an older MacBook is a great way of getting a great deal on yesterday's laptops. There is usually some stock of slightly out-of-date machinery to be found, although it can be thin on the ground — thankfully, they're not collector's items so you won't have to pay full price when you find them.