Question For Boxing Fans: Age Cutoff/Limit For One To START Boxing Professionally.

As the title states, I'm curious to know what you all think the cutoff for a person to start boxing, with the intention of becoming a pro and even a world champion. In fact, let's break the question down further. What is the cutoff age to start training, and then the cutoff age to turn pro. So hypothetically speaking, I'm 25, 6'2, 240lbs or so. Never really measured my reach, but its not super long. Never boxed a day in my life. Would it be too late for me? Not actually looking to become a boxer because I lack the talent and temperament (would get knocked out every time, because as soon as I hear b*tches shouting my name, I start showing off, no matter what I'm doing.) I am just using myself as an example, this is a general question. Discuss below!