Depends where their starting point was before they began raw foods. Many raw foodists are works in progress and have not hit their peak body. It is very rare to find a "rawie" from birth. The wild animal kingdom has its advantages trancending the collective story that is the current mainstream human experience.
If you follow Jinjee's link in her post, you will see her husband Storm who has been raw for many years, and at age 56 has the biological age of a 20 year old. They also have an infant that they are raising raw.