Answer:
Left to right I’m quite bright. Right to left I might bite.
What is it that given one, you’ll have either two or none?
What covers its face with its hands, speaks no language, yet most known what it's saying?
What kinds of men are always above board?
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.