One thing I thought of, based on @Tango's experience, was this!
You may remember me mentioning the girl that stabbed me in Swansea in 1972?
Well in 1997 I was managing a computer superstore in Aylesbury and in walked her brother who was the same age as me!
I recognised him straight away......it had been 25 years since I'd seen him last, but apart from normal ageing he hadn't changed at all.
Fortunately I'd changed a lot.....from this.....
.....to this.....
.......so he didn't recognise me. We actually spoke and I disguised my accent as much as possible, so he had no idea who I was.
Cos the last thing I wanted was his lunatic sister turning up with a knife again!