Everyone wants great abs because they define aptness, but great abs after fifty? Now that is a task. But it can be done with the right motivation. First understand that abs are really made in the kitchen, not the gym. It is authoritative to decrease body fat to a level where abdominal muscles can be seen.
This is done through understanding nourishment and how your body reacts to different food groups. Yes it is true that your body likely acts slightly differently than others with respect to food. This is the n=1 theory or the belief that each of us is exclusive to some degree. However your best chance for success is to base your diet on a comparatively high fat, moderate protein and low carbohydrate mix. You can know how to get 6 pack abs by visiting various online sources.
Yes high in fat but good fat. Fat is the favored fuel of the human body. Make the individual changes to your diet that make it work for you but to efficiently burn fat, you want to transition your body from a sugar burner (carbohydrate) to a fat burning machine. You do that with food. Eat good fats from natural sources like coconuts olive oil, avocado, meat, fish, fowl, eggs, nuts and seeds. Limit or remove totally grain based carbohydrates and opt for fresh fruits and vegetables as your carb source instead.