I have a 2013 MacBook Pro, literally over 10 years old. It is sometimes slow to a crawl and often can’t load basic websites. I have a separate work computer and an iPad Pro so I don’t use the MacBook much, but I was nevertheless looking to buy a new laptop to have a proper, usable computer for personal use.
I got the urge to try a fresh user account on the machine to see how it would run. I am absolutely blown away. It runs perfectly!! Sure, it’s not as fast as any modern computer, but for basic functionality, it works great! Highly recommend this to anyone thinking they need a new Mac if their current machine feels sluggish.