Yep you should take a fair slew of percent from other age groups and make a 5-15 year group. 16 yr restriction creates this bullcrap demographics. For example I just had to lie about my four year olds age in about four internet services so he can play online games with me (mainly factorio and minecraft). The other time he is using my account. Same for my eldest son, I have a twitch account but never used it, it was always his.
Next to no one I know watches twitch, but next to no one games either, and if they did watch streams they wouldnt readily say because it is ”childish”.