My dad was a fitness enthusiast. He exercised daily, ate what he was supposed to eat, didn’t drink or smoke, no drugs, and he died at 68. My mother, whom doesn’t exercise, smokes, eats whatever she wants (usually junk food and highly processed foods), is still alive and kicking and is now 77.
I lost faith in the whole “exercise for a healthier/longer life” mentality 9 years ago. Live your life, be happy, do things in moderation, and make sure you do what you love with the people you love. If that includes exercise, good for you.