Ten year old laptop is 2013 (this post seems to be from 2023). That's really not old at all. I use a 17 year old machine and it works great for basic tasks.
17? As in 2007? What are the specs on that thing? You running a lightweight linux distro on it? Surely you have an SSD in there and have upgraded the ram.
It's interesting how light KDE has gotten. It used to be the big, bloated desktop environment that you wouldn't even try using on old hardware. It seems to have traded places with GNOME.