That's how I feel! All my life, I grew up with all these ads about "age is just a number," and "60 is the new 40," and "you're only as old as you feel," and it made me believe getting older was kind of a dream, that it was all sorted, and when I hit 50, I'd be surfing and sculpting, mountain climbing and having outside afternoon hanky-panky, with my slightly-wrinkled-but-somewhat-rugged good looks...
...and then my eyesight took a nosedive around 45...and I developed severe plantar fasciitis at about 50, so I walk like Fred Sanford some days, and my shoulder joint is deteriorating, and both my elbows and one wrist are deteriorating, I can't remember a damn thing from one minute to the next, my eyes got puffy, I've got hair on my back and shoulders, and I have to get up to pee three times a night!
As to the outside hanky-panky...we get out there, then we forget why we're standing in the yard half-naked!