Walk daily long distance as you can and moderately fast as you can.
But you have to find a safe place to walk because there is risk of falling in old age.

Climb stairs in your home multiple times in a day that is also good.

Jogging is good. If you do not have high bp or any health issue then jogging and running
good to stay fit.

Swimming and playing sports that suitable for your age and health situation are good to
stay fit. Golf can be play in old age and some other sports also.

Quality sleep average 8 hours daily very important.

Drinking plenty of water will help improve your body functions.
If you urinate again and again then do not drink water at night because there is risk of
falling and will disturb sleep.
But long hours you did not received water, so drink room temperature water when you
wake up in morning and to get necessary minerals for your body add a pinch of salt and
lime juice with water. (according to some prominent doctors)

Be part of the groups that help poorest and visit sick people that will improve mental
health.

Think positive and be always in hope. Watch, speak, hear positive things as you can.
Avoid negativity from life.

Forgive and forget. Everything temporary in the world. Love everyone. This is will give
inner healing for you and improve your physical health also. This is important for
happiness in life.

Read or hear Bible for half hour minimum daily.
Thank and praise Lord Jesus for everything in your life.
Pray regularly. Jesus touched me and healed me from extreme depression and many
physical problems.

Full story: https://www.quora.com/What-are-the-top-ten-ways-for-seniors-to-stay-fit

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* Origin: The Hobby Line! BBS (999:1/1)