Do you have to be 21 and over to sign a lease without a parent or guardian?

I am looking to rent an apartment in south suburban chicagoDo you have to be 21 and over to sign a lease without a parent or guardian?
no, just 18. Unless IL is different. I sgned a lease in VA when I was 18 and one in CA when I was 20.Do you have to be 21 and over to sign a lease without a parent or guardian?
no
yes u do
No you just have to be 18 with a photo id and social security card to rent anything.