I’d say it’s time for you, mostly because you don’t have 5g, but honestly if you’re fine with it you can go until you’re not… you just are not getting security updates and apps may stop working eventually. (stop working as in be not compatable with newer versions of the app)
I live by them. At least when looking at cheap and capable machines. I must be really lucky with them I have more than 10 of them. All 2015/2016 models.