If I retired from my job and the company I worked for replaced me with someone else I would realize I did a pretty stupid thing and be happy that the company offered me 2/3 of my salary to do public appearances.
If I had a non-compete and still wanted to work I would go to my ex-employer and find a suitable arrangement for me to work someplace else knowing my position was already filled and it wouldn't be fair to the new guy to ask management to can-his-ass so I could get my old job back that I retired from.