I am 71. About every ten years I say to myself, 'Holy cow...I can remember wondering what it will be like to reach (whichever age I find myself while musing this). Meanwhile, I am active in a garden and in keeping a home and wife...who isn't aging particularly well if I'm being honest. Lots of issues, some seriously eroding her quality of life. I have at least three substantial hobbies with substantial (for my earning history, which is decidedly modest) investments of time, creativity, travel, and materials. HO scale trains and photography (see my gallery under 'gloaming' in the gallery section at DPReview website if you'd like), but also music, history, astronomy, and choral singing. I also volunteer, and that, alone, is one of the keys to staying healthy. It keeps you active, in communication with people outside your home, and it makes you have to think about things that might not be your favourite pastimes.

Walk, daily. Just 30 minutes is enough, but make that the task, not part of some other enterprise like raking the leaves. Eat sparingly, and avoid excesses of alcohol and simple carbohydrates. Do some strength training, muscle rolling, and stretching. Get enough rest, have contacts who email you or text you daily. And sometimes get out of your comfort zone. Pick up a new language or other skill. Hobbies are good for that.