I'll start by saying that I am a huge fan of Dear Evan Hansen and have seen it multiple times, and also have an 11-year-old daughter who has seen numerous shows. She has also listened to some of the music from DEH and loves it. However, it will be a few more years before I take her to see it. Yes the show has bad language, sexual references (may go over a kid's head, but may not and you may not be ready to explain them), drug references, and heavy themes. If you are turning down the music during "Sincerely Me," then you probably won't be comfortable with stuff in the show, which is more intense/explicit than the few "questionable" parts of "Sincerely Me." I have definitely seen younger kids at the show, but I also have friends with kids in this age range who aren't ready for their kids to see it yet, so it's whatever is best for you. Personally, one of the main reasons I haven't taken my daughter is that I think the show will make a bigger impact when she is older and can appreciate the themes more. But we also live close enough to New York that we can go whenever, regardless of tour stops. Maybe I would feel differently if the tour was our best/only chance of seeing it. Anyway, hopefully this offers some useful insight!