If you think you're too old to start boxing, watch George Foreman win the heavyweight title for the 2nd time at age 45. The best part is that he had retired from boxing for 10 years prior and weighed well over 300lbs before making a 10 year comeback trek.

He retired from boxing after a loss that changed his life completely.  He had a "death experience" and experienced God which led him to become a preacher.  It wasn't until he opened a youth center and needed money to keep it going that his prayers led him back to boxing.  Very overweight and completely cut off from boxing for 10 years, he started a comeback that he ensured took him from square one right back to the top.

He's gone through it all, poverty to riches, bankruptcy, back to financial freedom and he attributes it all to his belief in Jesus (and lack of it that landed him in dire straits the first time).  Good job George.