I think it's a good idea in general to just try and replace every switch and outlet if you buy a home that was lived in for an extended period of time. We moved into a home that the previous family lived in for 30 years and I've been working my way through replacing everything. I've found some crazy work in some of the junction boxes. Most weren't grounded which isn't super surprising. Many were wired incorrectly which is a little less surprising.

Also it's a good exercise in making sure the electrical panel is labeled correctly. Ours was somehow only labeled like 75% correctly.