. >> he's young, as in 104 years young, his name appropriately leonard youngman. we take an exclusive look at what makes him so young at heart. >> nothing. >> reporter: leonard loves to play pool at 104 years old, his reflexes are good, and his aim is straight. >> i hope you're not expecting to win with me. >> i am. i am. >> reporter: leonard spends his free time cleaning the table with good friends. he's a real inspiration for these younger guys. >> leonard drives. he just bought a new car a couple years ago. >> a chevy impala. >> he does his own cooking, gardening, comes here whenever he can. >> reporter: when he's not playing pool he volunteers at a job he took on 22 years ago. >> my wife was here for 3 1/2 years. i took care of her plus other people. i've had a lot of people -- and insure short of help so i helped. when my wife died, i just kept coming. >> reporter: 16,400 hours of volunteers to be exact. leonard keeps busy guiding people through the hospital campus. he also works at the information desk. if he's not too busy he's always good for a story. >> i