Restricting calories sufficiently can create weight loss at any age. Metabolism is not magic but basic chemistry/physics, if output exceeds input this will happ

Restricting calories sufficiently can create weight loss at any age. Metabolism is not magic but basic chemistry/physics, if output exceeds input this will happen. Of course each of us is unique, and also changes over time, so efficiency of both inputs and outputs varies. I believe you meant that its mentally hard to restrict one so much in later age to suffer from hunger enough to lose weight, but technically its doable and happening in millions of instances around the world all the time (ie due to long term illnesses). Exercise helps tremendously of course, and everybody should do enough of any healthy type every day to get sweaty (and more). But it isn't necessary to lose weight, not at all, at any age.