71 this year. Not much I still can't do.
Vitamin D, daily.
Get away from the TV.
Remember that if your retired that the job will be there tomorrow too. You don't have to accomplish everything at once. Pace yourself.
Exercise!!
Most of my meat is harvested by myself. Moose, bear, hares, shrimp, salmon, halibut... Too much snow to raise chickens.
Avoid processed foods.
Don't be afraid to ask for help. You probably have more favors owed to you that you will ever use up.
Never give up, never surrender.