49 here and still hitting it 6 days per week.
I do a heavy, medium, light day when lifting. I put the light day in the middle. I also change the routine for the light day. Mixing it up is fun, it breaks up the boredom and gives my body a “working rest” day.
For example, instead of doing dumbbell bench presses (it that’s my routine) I will do push-ups with a weight vest.
I do sprints once per week. And also have two other days where I do some form of cardio, depends on the mood Im in as to which cardio I do. I do know that no matter what anyone says I always feel better and key numbers on my blood test are better when I do cardio three days per week.
There are plenty of ways to perform cardio: running is the obvious one. But there are many, many other ways: Biking, swimming, basketball with my son, sledge hammer work against a tire, famrers walk etc. Get creative and have some fun with it.
I think how hard or often you train has to do with other factors as you age.
- Proper nutrition (food and supplementation).
- Proper sleep
- Proper stress levels (outside the Gym)
- proper active recovery, such as, massage, ice, swimming etc.
As long as you feel good and you are achieving results it matters not how many days you are training. Your body really is the best judge!