I have a mower that my dad gave to me, which his dad gave to him.

It is in rough shape, but it still cuts grass perfectly fine.

I have a wippersnipper from before I was born which runs perfectly today. It was left out laying sideways in the rain for about a month. Quick clean and a new plug and it was going again.

I'm sure the electric devices can run a long time, but when they fail, they tend to be not repairable.