Short answer: yes. If you want to remain vigorously active, you have to push against the tiredness and make yourself do it anyway.
Here, as an example, is my father’s life:
For reasons best known to them, my parents moved from the city out to the country in their 50’s, while my father was still working. They had about 25 acres or so, on which they had a vegetable and fruit garden, and some acres devoted to pasturage, and some devoted to hay production for the winter. They had, at various times, cattle, pigs, chickens and rabbits, but always cattle. My father had to get up every morning and milk the one cow and move the sprinklers in the hay fields, before he went to work; he did this again when he got home from work, plus of course hundreds of other chores and projects around the farm.
When they sold out and went back to the city my father was 67. He still had a 30" waist and could still buck hay bales.
For the next 10 years, he kept active doing home renovations, buying cheap, fixing them up, then renting them and eventually selling them to the renters where possible. He was still very healthy and active.
Then my mother got too frail to be left alone so he had to give all that up. He got no exercise at all, and within 5 years he didn’t want to hardly move. After my mother died he refused to perform any kind of exercise, even though he had an operation for spinal stenosis from which he needed exercise to recover his mobility. To avoid walking anywhere, he got a Segway and rode that around and even took it inside stores. So he kept mobility of a kind, at the cost of his own ability to move. By the time he died at 87 he could barely shuffle from one room to another, and the only reason was that he never exercised, never got out of breath.
I fight this tendency by going to the gym four times a week and forcing myself to do cardio for up to an hour. I get hot and sweaty, and some days are harder than others. I also do extra walking on my commute back and forth to work (not using the closest train station, for example). Even with that, I don’t walk as fast as I used to and I probably can’t walk as far. But it’s a lot better than it would be without this extra exercise.
My heartfelt advice is don’t give in to the tiredness, push yourself to do it the hard way, and add in some extra exercise just to keep your blood pumping. There are different ways to be old, and in my opinion the easy way is the hardest.