I'm once again intrigued by the interesting age breakdown. As I said in the "age polarization reversal" thread:
https://uselectionatlas.org/FORUM/index.php?topic=167977.0the 2016 polling we've seen so far seems to show that while people under 30 are Hillary Clinton's strongest demo in the general election matchups, she also does very well with those over 65, while the GOP does best among those aged 30-45 (in contrast to the Obama elections, where the GOP's strongest group was olds). Well, in this poll, we see that the same phenomenon exists when Klobuchar is the Dem. nominee. It's not just Clinton. It might just be a consequence of not having Obama on the ticket.
In any case, in all of the matchups here, the GOP candidate's strongest age group is those aged 30-45:
Christie/Clinton:
18-29: Clinton +23
30-45: Christie +9
46-65: Clinton +7
over 65: Clinton +20
Christie/Klobuchar:
18-29: Klobuchar +14
30-45: Christie +11
46-64: Klobuchar +8
over 65: Klobuchar +13
Rubio/Clinton:
18-29: Clinton +40
30-45: Clinton +3
46-65: Clinton +12
over 65: Clinton +21
Rubio/Klobuchar:
18-29: Klobuchar +20
30-45: Klobuchar +4
46-65: Klobuchar +15
over 65: Kobuchar +19