Younger, less educated, lower-income, infrequent voting males on the one hand; older, highly educated (and thus probably upper-income) female political junkies on the other.
What is interesting, is that most Democratic voters probably fall into neither of these camps (except for being either male or femalenot forgetting the nonbinary or fluid voters as well): most are middle-class, modestly engaged, pretty regular voting neither youngest nor oldest voters with some college. Where that leaves the primary race, I still don't know.
As for me, I guess I'd consider myself in the mid- to upper-mid middle class, post-graduate education, younger senior, regularly voting (never missed a local, state, or federal election in 48 years), pretty well-informed camp. Neither of these candidates is at the very top of my (still undecided) list. Color me confused.