what is the difference between an adult and a teenager?

Teenager is the person between 13-19 years old, as they end with Teen. The Adult is the one who is more than 19 years old. Are you an Teen or Adult ?

teenager dont have a perfect mind to think that all thing which one is good or bad but a an adult have a perfect thought to see what happens in their surrundings what things is good or bad for them.an adult take decission urgently but a teenager dont take decission they want some adult to take a decission for him/her.

when u r trying to see a girl it is teenage when u r trying to stop the boy to see a girl it is adult when u r trying to love a girl it is teenage when u r tryign to reject love of u r son/daughter it is adult.............. when u r wacthing bf's it is teenage when u r practicing what u watched is adult

Maybe teenagers are young people and adults are people of another age. In theory the adults are more mature than teenager, but a lot of adults has a brain like a teenager. Isn't it?

a teenager behaves quite immaturely.hes not able to understand his reponsibilities well n its time to enjoy.when one turns an adult he has to act maturely n has to be responsible.one stops being kiddish.a teenager will generally not know the difference betwen love and infatuation.but an adult does.

Well the whole word "Teenager" came from the age they where i,e thirteen etc, as soon as you reach 20 (out of the teen) you are an adult.. atleast thats what i think! but most obvious is attitute, personality, dress sense etc!