Rippetoe is the pro, and I am just an educated amateur but I'd rather see this particular client engaged in a balanced fitness program along with some "nutritional" aka eating guidance. Still, the results are impressive: From Heart Patient to Lifter
But can he run (not jog) a mile? Readers know we favor a balance of HIIT Cardio (total 1/2 hr/wk), Endurance "cardio" (1 hr/wk), serious weights (2 sessions/wk), and calisthenics (2 sessions/wk) for full functional fitness. I doubt that Rippetoe would argue with that, but he is mostly a weights guy. I don't know about our readers, but I find a one-hour calisthenics class to be more challenging - and more satisfying at the end - than anything else I do. They get you jumping and moving like a 16 year-old. The endorphins make you feel like you can take on the world, but you can hardly walk or talk. That tells you that you have done something hard.
Age is no barrier to any fitness pursuit. The body is made to adapt to demands. The discipline to make those stress and dietary demands is the hardest part, but it builds character. No pain, no gain. Best not to wait until you are scared into it by a nasty problem.