30 is Old

So, is it just me or does your body just start falling apart once you turn 30? I can't believe how much I've been getting injured lately. So, last fall I hurt my leg running (a tendon in my quad) and now I've hurt my knee (I think it's runner's knee). I'm pretty sure I did it running and now it's even aggravated when I cycle. I'm so frustrated! Remember the days when you could eat anything you wanted, exercise as much or as little as you wanted and you were still healthy as a horse? Wow - how I miss those days. And, doesn't it just go downhill from here? Every year you age, you have to eat less and your body starts giving out. Not looking forward to it!