adults only, verified
I'm one of a few hundred people on Twitch who really doesn't want younger kids viewing my streams. The games I play may not be violent, but my language is salty. It is great we have a warning screen, "You know you have to be 18..blahblahblah" happening, but I want to ensure that those who have signed up for an account aren't clicking OK anyhow. I live a PG13 life, and I prefer to have my streams reflect that.

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Kozaka commented
Anyone can create an account on Twitch in 2 seconds, and say I am 18 or 21. Then this blocking is for nothing! Also the Adult Stream...18+ stream warning is for nothing. Makes 0 sense. Anybody can view any stream. You do not even need to be logged in to watch a stream.
Except, everybody should send his ID card + Address and Twitch checks the birth day of the person. And also then troll users could be filtered out easily (and maybe reported to police the person + address).
Because this will never happen. You can forget this idea I think.
Only thing what would be useful, if you mark your stream only for adults, then a viewer must be logged in, and check the mark "I am adult". Till then, nobody could read the chat or watch your stream. I think this would be possible...filters out 2% of the kids thou.