Actually they both will but with a big difference, like today the people would prefer to ride the newer one. The only people interested in these old bikes are old themselves and most likely in 20 years most will be lucky to still be alive much less riding. Take a look at the recent demographics thread regarding the ages of the participants of these forums which are way older than the actual participants of the sport. Or perhaps examine the prices of vintage bikes which has collapsed due to a lack of demand and surplus of supply.