These old girls will often have a very soft coat. Estrogen replacement therapy is of great benefit. This is not a life long regime and is no burden for the owner. There are several things an owner can do to make an elderly dog more comfortable. Keep your old dog slim.
Excess weight is a burden to heart and kidneys.
A multi-vitamin once a day is helpful. Make sure fresh water is available at all times. Provide more than one water bowl if your dog is not very active. Above all else I find dental care contributes to longevity. If your old one has a very diseased mouth discuss using antibiotics with your vet before teeth cleaning.