I would like to have them both refurbished if apple will do it. and if so approx how much?---it beats looking for presently refurbed models and I know the history of these...thanks
	
		
			
		
		
	
				
			There’s an official doc, so they are both minimum vintageI'm pretty sure that the 2013 is vintage but maybe the 2017 isn't. But Apple doesn't really do anything like refurbing - they mostly fix stuff that's broken, needs a replacement (like a battery), or needs an adjustment.
I have a third-party place that works on Macs. I have a 2017 iMac Pro and I would have considered upgrading the RAM and storage if it wasn't losing support in two years.
I'm not a big fan of the current crop of "one-size-fits-all" iMacs either... but it's worth pointing out that Apple does have solutions for larger screen requirements: you can attach any screen that you like to a Mac Mini or a Mac Studio.I am disappointed with Apple not to consider older people with needs for larger screen, backlit keyboard for example.