No one told me about this!

Fifty's the new 40, you're not getting older, you're getting better, along with age comes wisdom!
Who said that?? When I was younger, I swore that I'd grow old gracefully. I would stay fit and strong. Aging wouldn't slow ME down. I wasn't going to freak out over gray hair and run to color it. I'd let it turn gray naturally. Boy was I in for a surprise!
Don't get me wrong. I wouldn't want to go back to my 30's or 40's. I like my age. I feel wiser, more self-assured, more confident,.....usually. I just don't like how my body is giving up on me....weight gain where I didn't expect it, while I'm starving, stray hairs nobody told me about, gray hair that grew in like Morticis's gray streak! What's going on here?