Uncle Peter wrote

A woman just told me she had her house rewired because it hadn't been done
for 30 years.

Mad.

Have you ever bothered?

Nope, and I did mine when I built the house in the very early 70s.

I mean if it works, why not just leave it? Wire doesn't rot.

The insulation can deteriorate, but not that quickly with stuff done 30
years ago.

The insulation of mine is fine and some of it gets stinking hot in summer
because its on top of the insulated ceiling, with a flat metal decking roof
only a foot above that and we can get 10 days in a row over 100F in summer.