I think doing resistance training is a big thing as we head into our 50's and 60's. Maintaining muscle mass and strength will help you keep your metabolism and joint mobility at an effective rate. Lots of band work, and dumbbell work along with core stability, rollers and stretches.
For cardio, power walking and swimming are great for fitness and weight management.
A diet full of super foods with anti inflammatory and anti oxidant properties is a good thing, and eliminating vices ( Smoking, alcohol etc)
Best supplements ( or my favourite ones) include magnesium, CoQ10, fish oil, vitamin C, whey protein and bergamet are good.
Focusing on effective periodisation in terms of training intensity, frequency and volume needs to be monitored and this I feel should also include your work/life balance.
Being happy and relaxed without unnecessary stress can do wonders