As regarding strength training and our senior citizens, it would seem that the medical profession has blinders on. It only stands to reason that anyone of any age who is frail and weak should be advised to find ways to make themselves stronger, lest they become so frail and weak that they die. The only real consolation the medical people usually make towards strength training is to tell them to walk regularly. This is grossly inadequate. While walking is better than sitting, it does little towards gaining strength.
Increased strength has a beneficial effect on everyone.
With seniors, it's too commonly accepted and expected that the older they are, the fewer physical things they are capable of doing. The medical community will typically advise older people to not strain themselves to avoid injury. The direct, predictable result of not straining themselves over a period of time is that they become frail and weak. Frail and weak people often fall and break bones. There have recently been small amounts of progress towards turning this atrocious situation around.