You're only as old or young as you feel.
Regarding the OP's statement, I would say 30 and under, because at that age, you have so many options and are still figuring out life. I mean, shit, even 35 or 40, or whatever age you are, people grow. Or at least they should. Which is why people get divorced, start new jobs, careers, move homes, states, etc.
I know I'm getting off topic, but I guess in terms of at what point is the "cut off" point to get out or put a toe in? I would say try and stay out till your 30. Some people may try it once and get hooked, like anything.
From my personal experience, (even though I started at an older age), if I had to do it again, I would. The women who I've met in this business were great. Some beautiful, interesting and amazing women I would have never come across had it not been for this.
I also made the cardinal sin of falling for an escort. I know, I know. I know my story has probably been said and heard a thousand times over, but this really felt different. I will say I made my feelings clear early on, she didn't reciprocate, not with just me, but she said she didn't want a relationship with anyone. She didn't think she could and she was a genuine person. She didn't try to "take advantage" knowing what I told her, was flattered, had no idea, and we talked it out.
As long as you keep your "feelings" out of this and are mature no matter what your age, and are able to do it financially and responsibly (not doing shit that may fuck with your health long term), I say live, love, laugh.
Life's too short. Especially with the introduction of 'rona into our world. The misplaced xenophobia and hate springing up everywhere, or people just really starting to show their true selves, and the mental impact all this "social distancing" and mask crap is having on people, who knows what this world looks like in 5 years, if we're even still here.