Mine is around 6-7 years old. Started off as an Antergos on T450s, then moved to T480 and later on I replaced the extra repos and the startup logo with EndeavourOS after the Antergos ones went dark.
However, I can see a noticable slowdown and some services occasionally acting weird - once every few months i need to switch to a terminal and use loginctl to unlock my session. I am seriously considering a reinstall, no matter how humiliating that sounds.