Dave Wasserman posted an interesting chart this morning showing the averages in different demographic groups over the last few months and the final 2016 polls. The thing that jumps out is that Trump is doing pretty close to his 2016 average among most groups, but Biden is doing significantly better than Clinton's averages in the same groups. The glaring exception is age 65+, which has gone from 49-44 Trump to 53-44 Biden.
https://twitter.com/Redistrict/status/1318555816195203074
White non-college: +11 D Swing
White College: +8 D Swing
Hispanic: +8 R Swing
Black: +1 D Swing
18-34: +19 D Swing
65+: +16 D Swing
Men: +4 D Swing
Women: +9 D Swing
based on margins last time in polling...
