8 year old _desktop_ computers (that have anywhere from 3 to 6x more watts hitting the CPU) are one thing. Also consider whether your machine has a dedicated GPU. A Chromebook or other budget-to-mid-range laptop from 2015 would have a different experience, although I'm sure they're still usable.

I was daily driving a 2009 MacBook Pro for a while in 2018. It was... fine, especially as a Vim user, but if someone else used my computer, they would most certainly comment or complain with normal web browsing.