Since grammar school, I thought of middle age to be an age over 55 years old. This study, published in the Archives of Internal Medicine, claims that those fit in their 30s to their 50s may have less chronic illness later in life.
http://www.cbsnews.com/8301-504763_162-57501737-10391704/people-who-are-more-fit-during-middle-age-have-less-chronic-illness-in-later-years-study-shows/?tag=cbsnewsMainColumnArea
My third book, Pocket Guide to Fitness, is available on http://www.Authorhouse.com and http://www.Amazon.com. If you look up my name on those Web sites, you will find my other books The Boy in a Wheelchair and Life, Work and Play: Poems and Short Stories.
http://www.cbsnews.com/8301-504763_162-57501737-10391704/people-who-are-more-fit-during-middle-age-have-less-chronic-illness-in-later-years-study-shows/?tag=cbsnewsMainColumnArea
My third book, Pocket Guide to Fitness, is available on http://www.Authorhouse.com and http://www.Amazon.com. If you look up my name on those Web sites, you will find my other books The Boy in a Wheelchair and Life, Work and Play: Poems and Short Stories.