The Thing About Life Is That One Day You’ll Be Dead is a hard book to classify: is it a precis about how the body ages? Yes. Is it a memoir of the author’s and his dad’s aging? Yes. Is it a family memoir? Yes again. The author starts with a simple observation of his almost-centenarian father’s amazing vitality and spins a tale that includes his own childhood in San Mateo, CA, his past physical prowess until an untimely accident in high school , his experience as a father and a sometimes helper to his own father — as well as copious literary and scientific quotes about aging and funny random observations including very late night TV lineups.