"Doctors tell me I have the body of a thirty year old. I know I have the brain of a fifteen year old. If you've got both, you can play baseball"

Pete Rose is recommending that having the body of a thirty year old and the brain of a fifteen years of age is an excellent mix for playing baseball. He is implying that having the physical strength of an adult and the imagination of a teenager is an ideal combination for the sport. He is also suggesting that age is not a barrier to playing baseball, as long as you have the right mix of physical and psychological qualities. He is motivating people of all ages to pursue their dreams and to not be discouraged by their age. He is also highlighting the significance of having a great balance between physical and mental strength in order to master any sport.