I'm 21 and in pretty good shap. I go to the bars a fair bit (in bangkok rn) as I like the atmosphere and shows more than anything. Have offed a few times though.
There tends to be a mix of perspective depending on the bar. I'd say the vast majority don't give a shit about spending time with someone younger and decent enough looking and just want as much money. Whilst others, mainly twinks, give me a lot of attention.
Once I asked a hot guy from Fresh Boys to come sit with me. But at the same time an elder Chinese guy did too. He picked the chinese guy. Haha =(