Does It Matter How Old You Are?

Age is an interesting concept. Many cultures attribute more authority and respect to a person as they get older. If you talk to someone and find out they are very young or old, do you treat them differently (maybe even subconsciously)? For instance, would you challenge their point of view more? How does this relate to internet forums where the age of the member is often unknown. When people engage in relationships a large age difference is often something which is frowned upon.