Hi, OP. Hope you are feeling a bit better today. Advanced age is never an excuse for being unkind (excepting where there is dementia). You are a perfectly healthy weight, exercising regularly and seem to be eating a healthy diet. You also sound lovely.
People who have not heard of the "obesity paradox" might find the following article interesting:
www.irishtimes.com/life-and-style/health-family/the-muddy-waters-of-body-mass-index-bmi-1.2660175
Everybody knows obesity has an impact on one's health. However, there is very little evidence that being moderately overweight (which the OP is NOT!!) affects health or longevity. On the contrary; people who maintain moderate overweight seem to live longer! It's probably healthier, for example, to maintain a BMI of, say, 28 consistently than bounce repeatedly between 20 and 28.
GetAHairCut's post above was so excellent and incisive, I am taking the liberty of reposting it!
"OP women of that generation were extremely limited in what they could do in life.
Their choices were limited and their powerlessness made them very protective of their few assets. Looking 'good' would have been one of their few assets.
Unsurprisingly this generation often find it hard to get past those social imperatives, which include policing not only their own physical appearance but that of other women too.
Those social imperatives beat all manners and common sense.
Feel sorry for her. She has probably lived her life with almost no voice except on issues such as these.
Posters who come on to tell you that in fact you are fat have no such excuse. They are just dull at best, self loathing at worst ( because why else would someone say that to another woman in this context?)."