Dick Van Dyke ’s cracking jokes about hitting 100 ... proving he’s still got the charm, even if the candles on the cake are about to hit triple digits. The legend hit up the Vandy High Tea at Vandy Manor in Malibu this weekend ... where he joked about becoming a centenarian on December 13 -- quipping it’d be hilarious if he didn’t quite make it! Classic Dick, still sharp with the humor ... later admitting if he’d known he’d stick around this long, he might’ve taken better care of himself.