At my age, 82 I can truely relate to your thread title...
"sucks to get old..........."
Some of my friends have a saying, "getting old isn't for sissies"
Yep. But, some of my friends have another saying: "but it does beat not being here... so far." I can go with that too... so far....
In winter when I can't walk on the back roads or up in my meadow and it seems too much of a pain to drive over mountain to a mall where they've laid out a walking course for seniors, I do more dance workouts in the kitchen while waiting for stuff to boil, cook, cool off or whatever.
I also try to get in some daily efforts at shuffling my stash of fabrics around after the carefree muddling of it that I end up doing all summer. My fabric inventory is partly on the second floor and partly in a first floor studio. So... six or ten extra trips a day up and back downstairs to sort stuff out properly has to count for something, I figure.
Anyway that's the excuse I use to sneak bread or a potato onto my plate despite menu planning efforts.
Anymore I just try for a break-even on weight management issues over winter. Once spring comes I'm back to trying to eat healthfully in consistent fashion, and so to lose one more pound now and then without even noticing it... to make the other 20 lbs the doctor had in mind when he said lose 50. I met him more than halfway by losing 30 in the past few years, and have trouble getting very excited about the rest of it.