I don't have any experience with Mac OS, but I do own an iPad for a couple of years. It's a good device but I'm having trouble with constant iOS updates that are forced downed my throat. It is slowing down my device year by year and it's nearly impossible not to accept the updates. Since now I'm looking to buy a Mac (Air 11'), I'm scared it will be phased out in a couple of months and I will start facing the same problem with the updates. So now I'm wondering, does Mac OS have a similar update system like iOS, where you are nearly forced to accept them and will slow down older machines over time? Or can you survive on an older OS? Thanks in advance!