what age did I become a dirty old man??

Ok, I have recently turned 50, am now 52, and have not dated
for 6 years, despite having been divorced that long. Now
though, I seem to have crossed over a threshold, that i was
not aware existed. Some time, I seem to now be view as a
dirty old man,, ( because I want the submissive role in a
relationship), instead of some one, who would be considerd,
not too bad a person. How did this happen? Are there
training camps for men to go to, to learn how to adapt to
this change of life?? :-)
I am sure I am not alone in this,
and wonder how others cope with this