One thing I would say is that women in Mexico don't like older men that can't wear their age well.

60 years olds acting as if they were 35 are not going to endear themselves with the local female population, if in the other hand you are realistic about who you are, local women are far less "ageist" than women in other places.

If you are looking to relate with US expats only (always a bad idea IMHO) I wonder if you would do much better, after all external appearance matters far more in the US than in other places as far as I can tell...