Like you said, tinder is mostly a hookup site. You being 72 were you expenting 20-30 year old women to hook up with you for sex?
So, of course you only got interest from prostitutes. I guess you don't fancy sex with 72 year olds? There is in fact a lot of women on tinder who are not prostitutes.
I just turned 50 and I would not be expecting any normal girl in her 20's to be interested in me.
Another post of grand delusions