I listed just one and the most important reason not all the reasons.

And they can't find any talented 20 year olds? Come one seriously. There are a lot of actors out there who can act and are closer to 18 than 30. If they insist of having high schoolers in their shows then they shouldn't be considering 30 year olds for the role to begin with or else make the characters a little older. This is a problem with the movie/tv industry and like I'm not trying to start an argument with you here or something. It's been a thing for so long and the producers may think it's fine and a norm by I as an audience just find it weird.

You may not think there is anything weird about 20 year old nina romancing 27 paul or 30 year old ian but I think it's weird. When producers start ignoring the real life ages of actors because it's their job they're acting who cares etc I find it creepy. Obviously this issue goes beyond what the topic was here which is ben's age and his role in legacies may not be like that but I'm talking in generally about the industry. You think the age doesn't matter because acting and chemistry and all that is more important but I don't think the same. They cast adults to play teens and then have kissing and sex and partial nudity scenes (it's cw so it's not too extreme but you get the point) between them but as I audience am supposed to believe these ppl are teens and that just gets creepy for adults to be writing teens like this. They can get away with it because in their defense the actors are legally adults. I hate when riverdale and pll and tvd did it.