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One interesting trend in recent polls is that Biden seems to be doing a bit better among over 65, and worse among under 30. I think some of it is probably attributable to this:https://twitter.com/nate_cohn/status/1205487298445533189?lang=en …
TLDR: without any special steps to address it, older respondents to telephone surveys are wayyyy too female, helping Biden, and young voters are overwhelmingly male, helping Trump
There are a few polls that take steps to help this--Selzer, Times/Siena, at least some polls fielded by SSRS. But most others, including very good polls like Monmouth or ABC/Post, don't weight on the interaction between age and gender, and you get this bias in the age crosstabs
To test this out, I went and pulled the most recent Monmouth data and tested two very simple sets weights: race, edu, age, sex vs. race, edu, age-x-sex. (cc @PollsterPatrick)
The difference on the topline was non-existent (a net-.03% shift). But the tabs do shift a bit. Biden's lead grows by nearly 4 points among voters under age 35 if you use the interaction between age x sex, while Trump's lead grows by over 2 points among voters over age 65
There's essentially no difference on the topline for RVs, but it does make somewhat more of a difference in terms of likely voters. Biden's lead among those who are "almost certain" to vote shrinks by 0.5 pts if you weight by the interaction
Why is this? I know you're not a psychologist but do you have any data-based explanation
Or people under 30 aren’t too fond of Biden. 
young actual voters are overwhelmingly male? Or young respondents are?
Respondents
If so, why was Trump doing so well with over 65 group for most of last year?
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