Why must we be 16 or older to use it? – Period Tracker - Eve Review

I downloaded this because I just recently got my first period, and my older sister recommended me download this to keep track of when it will occur again. However, I can’t even use the app because you have to be 16 or older to use it, which doesn’t really add up. Please lower the age requirement because majority of girls have their period before 16, and it just doesn’t make sense for you to only be able to start tracking at 16. And if it’s because of the apparent online feature, just remove that feature for people younger than 16??
Review by popo s on Period Tracker - Eve.