I had a 60 hour/week job and two kids I was raising. I tried to eat right/exercise, but it was hard. Nowadays, I'm retired, eat right (paleo with occasional indulgences
), exercise nearly every day, mixing weights, yoga and cycling. I weighed about 190 when I was 42, now it's about 170-175, and it's lean weight. I sleep 8 hours/night and take naps when I feel like it. I feel great!
So, the point here is that your physical condition is largely up to you. Some things that have changed:
My hair is almost Anderson Cooper white, but it's still there! I refuse to dye it.
My skin shows some age, mainly wrinkles, but they are mostly smile wrinkles!
Recovery from intense exercise is noticeably slower. I put 3 recovery days between heavy lifting workouts. Cycling long distances (100 miles) leaves me pretty tired for several days. I'm not strong on multiday cycling events.
Joints are getting a bit stiff. Yoga helps a lot.
Sexually, I do take Viagra or Cialis, and get erect like a teenager

. However, refractory time is a lot slower and two goes in a hour is usually an effort, so that doesn't always happen. It was never the main goal, anyway, so I'm fine with that.
So, eat right, exercise, sleep, and minimize stress, maybe learn yoga and/or meditation to help with stress. Age is not "just a number" but how your body changes as you age is more under your control than most people realize. Reject stereotypes, get out there and be active. Or, stay BCD and be active

. Or both!