Measured by growth in the number of quotes from Hagerty, these are the seven most popular cars for the younger (under 35) enthusiast by make and model, along with the most popular year for each. This list is less a matter of growing popularity of these particular models than it is growing interest from a younger crop of enthusiasts. All seven of these cars are already popular and have been for a long time in the classic market, and all are relatively common collectibles that are in the Hagerty Hundred Index. They are also all relatively affordable, especially the '69 Volkswagen.
This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2015/07/17/graph-of-the-week-most-popular-vehicles-quoted-for-people-under-35