It's ridiculous to say no-one under the age of 80 has died it's demonstrably untrue.
www.manchestereveningnews.co.uk/news/greater-manchester-news/inspirational-teacher-42-no-underlying-19677724
There are too many examples.
The thing is, there's a difference between deaths where we say, as a society, 'we did all we reasonably could to prevent it' and deaths where actually, masks in schools might have prevented it but we didn't bother, with really no reason other than we just didn't care enough.
And I agree we should have greater faith in our kids and stop treating them as if they're so inferior to all the kids worldwide who manage to wear masks without any problems at all.
I know a six year old who's worn one since August in school with no problems - he's proud to do so because he knows he's doing his bit to help the wider community (he's in a US state - one where they didn't need any more lockdowns after their first one because they kept rates low, so he's had consistent schooling throughout).