If you want to do it then go ahead. Train for a few months then see how you feel after that. I do see your point at being at a disadvantage though, fighting guys who have been fighting since they were 9 or 10 years old. It would be very difficult to try and go pro. You could train and maybe fight some amature fights and see how things go. You're not getting any younger, might as well give it a shot, good luck