...Not really made to appeal to those over 35 (though there will be those that age and older who it WILL appeal to, don't get me wrong, just not the audience they are wanting) as it sounds (the trailer) actually written for kids (but see the above)...
That is a bit ageist, and fairly wrong. There are a lot of diverse people over the age of 35.
This is the first time we're going to see a real representation of a D&D game in video entertainment. What abpout LoTR, WoT, GoT, etc...? Lord of the Rings is a fantasy story, and it inspired D&D, but D&D was only inspired by LotR. It has grown into something else, and we've never seen that 'table presence' of a D&D game translated back into a video based media.
ANYONE that has played D&D for a while will see a reflection of part of their games in this cartoon, and that is going to appeal when they give it a chance. We have people that were older than 40 in 1980 that have played D&D for more than 40 years. People play it in retirement homes. The guys that most contributed to the earliest editions would be in their 70s and 80s now. I know over a hundred people, personally, that are over 35 and are looking forward to this cartoon.
Further, putting aside D&D players, this is going to appeal to people that grew up on cartoons. The people making it understand the cartoon audiences - from anime, to old school. D&D wasn't their first area of expertise - cartoon shows are. This is a confluence of amazinglyu targeted high talent coming together to create the greatest ad for D&D there has ever been.
I think people are going to be blown away by how widely this is accepted, embraced and further monetized in the coming years. I expect they'll greet light Might Nein, the Bell-igerants (current campaign - not their real name ... yet), and new stories with original characters
set in Exandria - all in the next 3 years.