Assuming you're in good shape, over 6 feet tall and over 200 pounds, what's the maximum age you can start training at in order to have a shot at NXT/Tough Enough/The E?
Diamond Dallas Page didn't start wrestling until he was in his thirties. He became a World Champion in five years. While you have time, the sooner you start the better.
Unless you have an extensive athletic background or been wrestling since high school or have acting experience or look like a 8/10+ or come from a underrepresented nationality, I'd say you'd get overlooked.