How come most adults think that if you're under 25, you don't know anything?

I am aware that i obviously don't know everything, but in my experience most adults think and act like they do. They automatically cast off my opinions and ideas just because of my age. They always seem to underestimate me and group me with the other stereotypes, such as all i care about is myself, sex, and drugs. ??? I find that extremely ignorant. Why are adults like this?
For the love of god, who cares about my avatar? It's yahoo answers, this is not a place to be professional
 
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