SAINT-QUENTIN-EN-YVELINES (FRANCE) (AFP) - Robert Marchand is chasing another world record when he jumps on his bike to compete in the senior hour endurance on Wednesday. Make that uber-senior -- for, while still sprightly, the Frenchman is 105 years old and racing in a category all of his own. Three years ago he managed to ride 26.927 kilometres (nearly 17 miles) at the Saint-Quentin-en-Yvelines velodrome outside Paris, a record for someone aged over 100.