In the American Journal of Clinical Nutrition, it shows that protein in diet should be based on weight, not age.

It says there that as people age, the metabolism and physiology usually change and these changes influence a person’s nutritional needs.

With the research of Wayne Campbel PhD, a researcher and professor of foods and nutrition at Purdue University, it shows that younger and older adults don’t require different amount of protein to be healthy. This means that RDA of 0, 8 grams of protein per kilogram of body weigh should be adequate for virtually every older person.

On the other hand Joel Millward PHD in another research said that even though the study shows that an adult’s daily protein requirement is likely to be independent of age, it should not be classed as definite in terms of the absolute magnitude of the requirement. [via]