When you take all this into account, you can see the optimistic case for Trump. There's much lower turnout so far this year among 18-29 and 30-39 voters, and much higher turnout among 65+. New voters skew more male.
That said, the main good signal for Trump is weaker youth turnout, and one of Biden's biggest advantages over Clinton is decimating the age gap. Seniors actually favor Biden this year. And that may be reflected in the polls of people who have already voted.
1) You're comparing partial EV data for one election to total vote for another
2) Young voters in GA disproportionately vote on Election Day
3) There has never been a prominent statewide election in GA where EV was younger than ED
4) >500k seniors automatically received mail ballots this year because they voted in the primary - something that was never done before
Old people love to vote ASAP by mail. Young people almost always wait until election day, or wait until the last minute to return their mail ballot or vote early in person.
