My brother had a Motorola from 2014 until 2020. I gave a friend a smartphone from 2017 that I used daily until 2022 and he’s using it now. I’m sure you’ll be fine.
Also, the updates are weekly. I think they ship the latest commit or something, so skipping a few may not be a big deal.
Edit: answering the question, yes, you only need to download the latest
You can also use their own repo