Isn’t it better for older adults to “take it easy” and save their strength?

Regular physical activity is very important to the health and abilities of older people. In fact, studies show that “taking it easy” is risky. For the most part, when older people lose their ability to do things on their own, it doesn’t happen just because they’ve aged. It’s usually because they’re not active. Lack of physical activity also can lead to more visits to the doctor, more hospitalizations, and more use of medicines for a variety of illnesses.
Staying active is important throughout life. Regular exercise and physical activity help you stay strong and fit enough to keep doing the things you enjoy. No matter what your age, you can find activities that meet your ​fitness level and needs. 
This information came from the National Aging Institute website. (https://go4life.nia.nih.gov/how-exercise-can-help-you/)
"The National Aging Institute's website (www.nia.nih.gov) is an institute of the NIH, a U.S. Federal Government agency that provides accurate, up to date information about aspects of aging research, information about clinical trials, educational materials and resources about aging for the general public, and information for researchers and health professionals."