Not on mine you can't!
Some yes, but not all.
The reason isn't that "apple have prevented you", it's that it's got a 32bit UEFI "bios" (not really a bios but we'll let that slide...) you need a 64bit version for the newer OS. There was one (short) generation of 64bit core2s with 32bit firmware before they moved on.
So there is a technical reason for it, not an arbitrary decision.
Yes, they probably could have sorted a 32bit bootloader for their newer kernel etc... but at somepoint maintaining backwards compatability just isn't worth it when you want to make things more modern, and move on.
I mean taken to its extreme you might end up with windows!
As for laptop life expectancy - I generally have them 3 years (macs) then sell them on and they do many more. High end work machines last a long time too. Various family have cheapy dells etc - they don't last as long. But then they cost a lot less! There's about a factor of 10 between a cheap and expensive laptop, there's a fair quality/performance spectrum! Not a direct tradeoff (there's a flattening curve of diminishing returns for sure) but you do get what you pay for in general.
Buying Apple only makes sense if you are both loaded and useless with tech
Or not loaded, but excellent with tech? As it's always made sense for me, since student days...
Not aggressively pro-apple BTW, these days I use windows more, and linux too, I just like arguing on the internet, especially when I know I'm right