An 81-year-old Japanese man named Yoshio Kinoshita is your inspirational badass of the week. The retired grandfather recently took up skateboarding, ripping through his local skate park to keep his mind sharp. Kinoshita bought a skateboard as a spur of the moment purchase for 800 yen (less than $10) and the decision has changed his life for the better. Almost every morning, Kinoshita visits a skate park in Osaka and learns skateboarding tips from the local kids. “They are all my teachers,” Kinoshita says. “For [older] people like me who try to learn new things, if we don’t practice it little b…