This is all among 18-34 year olds. Of note, it was taken May 21-June 3, so largely before a lot of the protests and increasing visibility for racial justice in the country
RV:
Biden 51%
Trump 29%
Third party 6%
Undecided 9%
Wouldn't vote 5%
LV:
Biden 56%
Trump 31%
Other notes:
-A similar 2016 tracking poll between HRC and Trump only had HRC at 42% and 3rd party getting 22%
-Biden's favorability is +7 (49/42), Trumps is -30 (33/63)
-Other favorabilities: Barack Obama +47, Michelle Obama +45, Bernie Sanders +27, Andrew Yang +14, AOC +3, Kamala Harris +2, Elizabeth Warren +0
Most exit polls didn't break down 18-34 in 2016, but 18-24, 25-29, and 30-39, so it's hard to nail down exactly how HRC did. But among 18-29, she won +18. Dems won them +35 in 2018.
https://www.huffpost.com/entry/old-is-way-better-than-liar-why-joe-biden-is-in-a-stronger-position-than-hillary-clinton-with-young-voters_n_5eeab736c5b6aef1943fbd81?5l