In order to both slow the aging process AND play longer, you need adequate levels of strength, flexibility, and other physical abilities.
Golfers (and most others) lose as they age. The cause is quite simple. They do not partake in any form of golf strength training exercises to maintain the fitness levels they had early on in life.
It is NEVER too late to improve strength and flexibility. I have worked with golfers in person and via my websites that are in their 70s and 80s that have almost doubled their current strength and dramatically improved their flexibility (specific to golf).
Just by doing a simple golf strength training routine a couple of times a week, you will increase the level of strength and other important aspects, and not be as aware of the changes that come with aging. You cant stop it, but you can slow it down and even reverse it depending on your current level of fitness.
One of the major areas most senior golfers lose is the flexibility in their midsection (core), which is critical in generating power in the golf swing. As a result, the senior golfer will make a change in swing technique, rather than address the physical limation.
There are many senior golfers who can still play a good game of golf due to the fact of playing and practicing throughout the years however their swing execution, power and overall consistency has been dramatically affected.
Therefore, it is critical for senior golfers to maintain or increase strength, flexibility, even balance and coordination to preserve the performance or level of golf they so yearn to achieve.
Given the above scenario, I hope you realize the importance of golf strength training.