Indeed this is a worrying problem.
Good answers from many, but to me Ken4155 10:26 Sat 18th Sep 2021
and anneasquith 10:33 Sat 18th Sep 2021 are major factors, and as others have added, children also have these rising levels of mental health problems stuck in front of their very faces which surely has an effect. ( same for adults with all those too)
This generation have a level of exposure that previous generations were not exposed to, in gratuitous levels of sensuality, sexuality and violence on TV, video games, films, newspapers, and for some reason the same level of access,either directly or indirectly, to the filth that the internet allows free access to. (again this can also harm adults mental health)
Why children age 3/4 ? to under 16 were ever allowed smartphones and internet capable computers is beyond me - I know the genie is out of the bottle , BUT it could still be like fags and alcohol, made illegal.