You must always be on the move, not overeat, always be busy with something, both physically and mentally. I believe that only this makes our life happy and long-term.
It depends on who, in your opinion, falls under the definition of "elderly people". Among the long-livers, there are no fat men from the word "at all", with the exception of Winston Churchill (well, he also smoked like a locomotive, and planted a couple of bottles of cognac a day - a person with genetics was very lucky, it happens). Age-related sagging, ptosis, is different. A typical long-liver is always wiry and thin.
Elena, elderly people slow down metabolic processes of the body, metabolism. And when in old age a person begins to move a little, the calories consumed are not completely wasted, which leads to a high level of glucose in the blood, pathologies begin, leading to excess weight (diabetes, hypertension).
Taking into account that, that in women from 48 to 50 years, the production of sex hormones estrogens (and the most important of them is estradiol) is clearly reduced, and by the age of 55 the functions of the ovaries that produce this hormone completely cease, then a woman loses shape with age. Estrogens are designed to control a woman's health from figure ("hourglass", "guitar", "pear") to flawless skin, condition of hair, nails, bones and joints, metabolic processes and the entire cardiovascular system. Receptors for this hormone are found in a woman in all organs (or almost all).
And with age, estrogens do not protect a woman (they simply do not exist anymore), and her figure takes on a masculine type - fat is redistributed upward, in the waist, abdomen, which affects fat metabolism.
In men, with the cessation of testosterone production, excess fat deposits also appear, and testosterone leveled their estrogen levels (yes, men also have estrogen). It also gives their skin youthfulness and elasticity, supports metabolism and "prevents" cardiovascular diseases.
Well, when estrogen already prevails due to a decrease in testosterone, then with a significant difference, problems begin in men: the volume of the hips begins to increase, erectile dysfunction decreases, and the risk of prostate cancer increases.
So there are many prerequisites for being overweight and overweight in the elderly.