I am over 18. I may enter.
I am under 18, but I feel quite adult. I may enter, too.
I am 5 years old. Mom says I have to learn how to use computers and internet and therefore I may enter also.
I am 4 years old. I have to learn how to read. Pearl Hoon will teach me. I may enter also, too.
I am a dog. I have to wait outside.