It seems to me that the exercise for the mind, which poker gives, will be useful at any age. Great game for all ages. And if it's about a career, then there are plenty of examples of successful players of different ages. On the side of young people - mathematics and great endurance, on the side of older people - tilt stability and experience. I think so. So my answer is - you can start at any age, and finish - as long as you see and can hold the chips in your
hands. I started playing at the age of 25.