There is no way that with proper care your joints should be creaking at 30. And its absolutely bullshit that at 45 you can’t be in good shape or even better shape than your twenties. High level competition is done at all age levels, it has never stopped at 30 or even 45. If you are competitive you can find competition. But that’s rhe problem, most people just stop competitive sport, they hit their limit and find it hard to continue to improve. So they take other direction in life. But then also stop taking care of themselves and never kept a regime up. No, most just fall into the trope of the body ending after your twenties. It doesn’t, your body is capable of being healthy, strong and supple. Through food and light exercise to keep it up and if you want high level workout regimes.