It depends on how old you look and the content of the film you’re seeing. If it’s got strong graphic violence, gore, strong sexual references etc then cinema staff tend to be more cautious about who they let in to watch that film. I was 17 and asked for ID to watch Annabelle, a 15 film 😂 I didn’t have a lot of makeup plus I look young for my age anyway. Looking younger has its advantages, when you’re 25 you’ll be looking 18 and at 40 you’ll be looking 30! Appreciate it and embrace it. So many people rush to grow up and end up looking older before their time and want to look young again when they’re old. Appreciate your young years ❤️