TBH you may be better off asking discreetly on a seniors forum or within your local area. I’ve got friends of that generation but they generally do not discuss their sex lives on forums like this, as they are very surveillance aware (a lot of them had to do surveillance work during the Cold War).
on a more practical level, most guys of that age group who are not already booked into the elderly home and can barely walk are are parents/grandparents and starting to suffer from age-related health problems. Even if their former partner has passed on and they are free to have whatever sex life they can manage; this is more physical stuff and there is an increased chance of keeling over from the exertion and triggering off a potentially fatal health condition.
In my country (and much of Europe) inquest hearings are public info so its very embarassing to the family; plus as a sex worker you would almost certainly initially be arrested on suspicion of a safeguarding violation (elder abuse).
Added to which their own family will judge them or get judged by others (grandchildren for instance could get bullied in school). So whatever these they have got up to in the 1960s and 1970s, they often sensibly stick to less controversial hobbies and pastimes as they get older.
Also your profile shows up as male. if your biological gender and your “identified” gender are different that is not such a problem especially in coastal areas (nor BDSM, as rope and chain of all sorts is easily available without arousing suspicion), but its best to be 100% honest about these things.
