"The Baby Boomer (45-63 years of age) and senior (64 and older) populations represent the fastest-growing sectors in America and are the economic groups with the most disposable income.  What's more, Boomers recognize the importance of achieving and maintaining their health and are willing to spend money on experts in the fields of prehabilitation (designed to improve strength, stability and/or overall general conditioning prior to surgery) and corrective exercise in order to maintain their level of activity as they age. 
"Therefore, the fitness industry must be prepared to address the specific needs of these populations."
- Evan Osar