This is mostly anecdotal. it isn't necessarily the case. Your specifics and delineating sub categories is speculative. I can substantiate my claims with all kinds of data. Generational age cohort increases of all STD's, increases in previously almost eradicated diseases, increases in diabetes, obesity.
Not to mention everything that people just figure they should be doing now. Drugs of all types, even things like vaping. Use of hookahs. So much the case that todays younger generations just try out every fad without even thinking of implications. Really its like they don't even care about the risks.
Maybe its fatalism, but increasingly younger generations don't exhibit similar concern for their own lives, futures etc. Could even be depression related.
This is one indicator of how little concerned adolescents are about their health. There has never been more widely available preventative information, more availability of prophylactic, safeguards. Its just blanket not listening, not doing anything and just going out and banging. These stats are hopeless;
Adolescents and Young Adults | Prevention | STDs | CDC