From what I see, the younger crowd is big into no prep and anything involving the newer cars like LS, Gen 3 hemis, and coyotes. I'd say the no prep stuff is probably 75% or more made up of people under 40 years old.
The 28x10.5/275 radial classes are big around here to...kind of a mix of older and younger people doing that.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax