You were rude and ageist - no one has to retire at any age.
and the OP never suggested he did - you are just making things up now.
It isn't rude and isn't ageist to chat about life plans. It's normal conversation.
I've had conversations with people in their 20s about retirement planning.
As @AnnaMagnani said, it is a pretty normal conversation in jobs that are physically demanding, particularly - that's things like Nursing, emergency services, teaching, but also builders, gardeners, decorators, plumbers.
@Springtime111 - of course there are people able to retire when they get their works pension. Everybody has different circumstances, and, even if you look at everyone who has earned similar wages, everybody has made different choices over the previous 40 years as to overpaying mortgages, saving, or spending.