18-24s (when allocating the did not votes) go from voting for Trump by 32 to Jones by 19, according to this poll (which also asked about the presidential election). I think we feel this worst among younger and highly educated voters, unfortunately.
Yeah, most young and college educated voters probably don't like supporting a campaign that talks about social issues.
I think the main issue is that younger Republicans are less tied to party, more tied to principle and staunch conservative ideology. In most states in the primaries, Ted Cruz and Marco Rubio did incredible among the youngest groups. (especially Cruz.) - according to the states with exit polls.
Yeah, this had Trump only taking ~1/3 of the vote of Alabama 18-24 GOP primary voters as opposed to ~55% of all voters (both numbers likely inflated because Republicans want to say they supported him all along now). Rubio, Cruz, and Carson pretty much split the rest.
I think my Facebook feed is a pretty good barometer for well-off young ideological conservatives (nationwide), and Trump was not popular at all on it during the primary.