By Caroline Gaspich Dick Van Dyke appeared to be in a chipper mood as he hit a gym session with his wife Arlene Silver, 52, ahead of his milestone 98th birthday. The former Mary Poppins star looks incredible for his age as he is still healthy and active building up a sweat just one day ahead of his 98th birthday which fell on December 13th. The Grammy award-winning star looked in high spirits as he set off without the assistance of a wheelchair or cane for the gym and stopping for a brief chat with one of his excited fans. During the conversation the former Chitty Chitty Bang Bang actor was as…