Im an oldschool poker pro in my early 30s, its never been easier to learn to play if you are motivated but poker has a dubious long term future outside of some live cardrooms. I think it makes sense to go pro in your 30s if some or all of this is true:
-You live in a country where Xk$/month is a huge salary
-You strongly dislike authority
-You have a backup plan that wouldn't depress you (like becoming a teacher or some savings)
-You have a good feel of where you will play an vs who and are confident you could one of the better regs
eeking out a small winrate is very stressful, especially if you are just starting out or have no safety net. The difference between being a 3bb and 15bb/100 winner in terms of the psychological distribution of results like length and severity of downswings is usually underappreciated. If you are unsure of yourself, try to play a game you crush even if its small, the consistency of winnings will help ease the burden. I think it is worth the lower take home pay. (not to mention that people generally overrate their abilities and usually move up too much)
In general I think poker, or a similar sphere where people compete and battle wits on a relatively even playing field for money will always exist as a human outlet. So if you feel better at games or more passionate or harder working or whatever and can see yourself having some success in the field I wouldn't blanketly advise against it. Passion will help the most because it will ease the level of grit you need to get past the tough times.
Hope this helps