People are too quick to blame "bad genes" for their poor results. In reality this is seldom a major factor and they usually can't point to a specific genetic test result. While genetics might play a role at the elite and professional levels there is no real evidence that it matters for masters athletes. Good habits and training are what count.

There is no evidence that participating in sports wears out joints. Joints evolved to move. The majority of people who need joint surgery lead sedentary lifestyles. Building strong muscles helps to stabilize joints and reduces the risk of injury.