It seems very clear. All ages including 16 YOA and those below 16 YOA. It seems stupid to have to list every age just for the 1% of English speaking people who can’t comprehend English.

I’ve been waiting for the option of “Prefer not to say” as to my country. That’s my answer for everything, as long as it’s an option.

Because you’re not reading it. The format says “MM/DD/YYYY”.

I’m not a programmer and I’ve used it to code. It rarely works the first time around, but I’m sure it will improve quickly to be more accurate.