In essence Classic Scrambling is what motocross used to be. Harking back to the Golden Era of British manufacturers classic scrambling is focused around machines made prior to either 1965 or 1974 with increasingly more events also catering for evo, super evo and twinshock machines.
Riders can start from 16 on solo machines and 14 if a Sidecar Passenger, however some clubs may impose local restrictions.
This will depend on what machine you compete, clubs split the classes by criteria of bike age.