I ran a 5S that I bought in December 2013 as my primary phone all the way up to around March 2020, just as the pandemic was really winding up.
The battery, after ailing for a little while, had eventually just given up. I'd gone skiing a couple of times, with the last trip being just before lockdown, and I think it was the cold exposure of the second trip that dealt the mortal blow, and it died shortly after I returned.
I liked that phone a lot. It did, at the time, everything I needed, and it was a really nice size, but that period in 2020 was a bad time to try to get a phone repaired. I did attempt to replace the battery myself using the guide on iFixit but, sadly, that did not go well due to some contradictory/out of order instructions, and all I succeeded in doing was damaging the phone, I think, beyond repair.
Really good to see that Apple are still supporting them though.
Just so you know, apparently it's reasonably straightforward to replace the battery of the iPhone 5s, even easier than the iPhone SE (same form factor) for whatever reason.
A few years ago I bought a replacement battery kit that came with everything needed for probably something like $10 from aliexpress. I never actually got around to doing the replacement yet but maybe this update will give me the excuse to dig it up and replace the battery too ha!