My wife's daily driver is a 2009 Macbook Pro. I've maxed out the RAM, swapped the battery, and put in a SSD... it's running the most recent operating system and meets her needs (web, document processing, viewing of our pictures)... I wouldn't expect it to do any heavy lifting or editing but it's still quite capable....
I'm chugging along with a 2012 Macbook Retina (first edition)... I bought it maxed out at the time and it's still a quite capable machine.. I do a lot of heavy lifting with it (primarily photoshop, but some handbrake video conversion) and acquit happy with it...Battery life is starting to dwindle but that's as to be expected... I'm very happy with it, except it's quite a large machine so would love a Macbook for travel....
FDW