I am not 80 but will share what I have learned. 1st the USA medical system is not focused on curing its patients. They are trained to prescribe a medication to address the symptoms of your ailments and to keep you on those meds for life. Blood pressure, cholesterol, diabetes, you name it they have a pill for it. Years of abuse had me overweight and type two diabetic with other issues like chronic arthritis in my knees which made walking a chore. Covid wrecked my lungs and I was barely able to walk to the mailbox without needing to rest. That was 3yrs ago when I committed to go to Africa on Safari. A hunting trip as a motivator helps you to get off your ass and work on improving your health.
I found a holistic medicine doctor who works to cure his patients of most disease and to minimize the affects of the rest. He did a liver, gut and kidney cleanse on me over about 4 weeks using mainly supplements. He uses zero prescription drugs. He also uses a number of electronic therapies that may or may not be FDA approved. His clinic looks like Dr Frankenstein's lab. Some came from Nikola Tesla over 100yrs ago.
He placed my on a custom diet that was gluten free, zero processed foods, low carb, low sugar. I was taking 160 units of insulin a day and was dying slowly when we began. I weighted 320lbs and could barely walk. In only 2 months we cured my diabetes 100% and over 4 months, I lost 50lbs. Now, I am still a bit porky but it is a life style change, not a program and I am still getting better. I was walking 5 miles per day, three days per week and going to the gym on rainy days. The key is eating clean and well and moving every day. I have since been to Africa twice and am going to Canada this fall on a Elk/Moose hunt. I turn 70 in 4wks and feel better than I did when I was 60. The diet is the same thing Robert Kennedy is promoting today in the Trump admin. But, is tailored to your personal blood work. It also addresses parasite infestation that we all get from water, pets, and just living on this Earth. They are in your gut, your liver, and other parts of your body. Find the book "Cure any Disease" by Dr. Hulda Clark. Read it. It is part of the answer.
Today, I am completely off of Insulin and am working on loosing some more weight. Back in the spring I began a Shaolin Tai Chi class which is surprisingly effective when you practice it EVERY DAY. Even at my advanced age, I am an active professional engineer and just completed the construction and commissioning and testing of a pair of gas turbine power plants for a well known USA mfg of turbine equipment. During that project I generally had to walk more than 5 miles in the plant most days. No issues at all. Loosing weight is a chore but you just have to stick with it.
Just keep in mind that traditional medicine is not your friend. This is not the doctor's fault. They are simply following their misguided training. Some years ago, they changed the system where instead of the insurance company paying the patient for services who then paid the doctor, they now pay the doctor directly. So, the doctor no longer works for you. He/she works for the insurance company who manages the cost of your care. It is a bad model if patient well being and longevity is the goal. The model is to minimize cost of care. Living a healthy lifestyle does nothing to improve the profits of the big pharma companies.
Holistic programs are available but you will have to look for them. Some of the European programs are more effective but not practical for us to access. Eating right does cost more but one cardiac bypass will pay for all of that healthy eating. Exercise takes time but it is worth it if it enables you to go on one more safari before you die. I had a great old friend who lived to be 97. 3weeks before he died, he was in Las Vegas having a blast, eating, drinking, having sex with young women (they are all young when you are 97, lol). I am not saying that sort of lifestyle will prolong life but having a reason to live will and in his case, that was his reason. He remains one of my heroes.
I still drink Bourbon but instead of a couple every day, it is a few every year. I still eat pizza but not often. I avoid sweets and processed foods. We cook at home most of the time and eat a lot of venison, chicken and fish. I ride motorcycles and even today I have the reaction time of a formula 1 driver (0.15 to 0.25 sec). I was at a F1 race a couple of years ago with my son and got selected to compete in reaction time tests with six of the current F1 drivers and one moto GP cycle racer. They were demonstrating how fast these world class racers can be. I beat all of them except Verstappen who I tied with and only the MotoGP rider beat us by 2 milliseconds. I attribute this to using both sides of my brain every day. Things like shooting, riding motorcycles, flying, and driving a stick shift.
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