Tony Hawk says movement keeps you young, whether it's chasing your grandkid, dancing, or yes, doing ollies

Tony Hawk of United States of America competes in BOWL-A-RAMA at Bondi Beach on February 21, 2016 in Sydney, Australia. BOWL-A-RAMA is Australia's biggest skateboarding competition. Zak Kaczmarek/Getty Images Entrepreneur and skateboard legend Tony Hawk said he had to learn to say no to more things. He's calculated about the risk he takes, both in business and skateboarding. The little moments — on his board or at the beach with family — mean more as he ages, he says. This as-told-to essay is…