Especially as time progresses. These are ones I follow and think have merit. Please add as many as you would like. I am quite interested in your input.
1. Do some kind of cardio (I mean any exercise good for heart) daily if possible. Walking one of the best but anything you enjoy should be OK. I also like stationary bike and rowing machine too. I think 30 minutes minimum but can do more if you enjoy and does not hurt your joints like knees, ankles, feet and so on. I also think that if you have a job that involves a lot of activity that counts a lot too. Moving around constantly during the day can be beneficial. If I cannot do 30 minutes a day, I may do one hour three times per week too.
2. What you eat is very, very important. Balanced diet, with lots of fresh vegetables and fruits in addition to high quality proteins. I think that carbs should ideally be at 100 to 120 grams daily, depending on your activity level, amount of muscle you carry and so on. I am old enough to see Atkins and low carb come and go and come and go ..... I do not know anyone personally that has kept low carb up for their entire life. They may be out there, but I think balance, moderation and some degree of eating enjoyment is important.
3. Drink water every day, and I believe that coffee, soup, teas and pretty much anything contributes. I am not going to say eight cups, because I don't do that and I am not sure if I know anyone personally that does. If you do, great keep it up.
4. Stretch and do limbering and joint mobility exercises. Many become the tin man/woman as they age. Adds a lot of quality of life and injury prevention. Many Eastern disciplines say that a person is as old as their spine, or in a similar vein, the more supple and limber the spine the younger you feel.
5. Resistance training very important and as close to fountain of youth that exists (can be waste of time and negated with poor diet) Pick your favorites, whatever it is. I like to use them all: weights, cables (I use Hook and Samson Cables and Elastikon and some home made stuff too), bodyweight, kettle bells, isometrics, bullworker, crushers, Atlas type self resistance, etc.
6. Not sure about supplements. I think taken care of if your diet is dialed in, but multivitamin/mineral good insurance policy. I also think a high quality protein powder can be used intelligently too as part of a good diet, but it is not necessary.
7. Get fresh air and sunshine whenever you can. Also helps with relaxation and mental aspects.
8. Engage in some physical activity that you enjoy too. Some that I like are archery, skiing, swimming, biking, martial arts .
9. Nurture the spiritual or emotional and that does not necessarily mean religion. Meditation, Yoga, relaxation, mindfulness exercises, Chi Kung, Tai Chi (some of these are also good exercise and stretching and can strengthen too) Also, cultivate peaceful home life, whether single, married or anywhere in between. Try to remain in a state of calm and bliss, as much as you can.
10. Keep open mind and stay positive as much as possible, despites sometimes feeling that the world in on fire. Be your own experiment or lab. If something works really well for you and others say that it should not or science says it should not, ignore them. Conversely if something popular does not work for you, discard it.
11. It is very easy to over complicate things. Also, you can be on the same routine for years and years and dare I say your whole life. Don't need to shake up things all the time. It can be done and I do it myself , but not necessary.