Looking back over my family history, any that there is a record of seem to have issues with food at times. Grandmother always fought her weight, as did mother. Mother had less success. Father was on a "diet" ever winter, as he did less work in the winters. Grand father was likewise, but he also had more age on him.
As we age our metabolism and activity levels both reduce; hence our input must also reduce. It is more difficult now, but life goes on. Attitude change is necessary as in a suitable food program. Paleo, or LCHF, in some form seems to work for me.
The program is all about attitude change. Any diet would take the weight off me, if I could just stick to it. The program allows me to stick to the diet.