As we know elders having the right to do or obtain something .they have smart ability to teach. they have good communication skills 
its not necessary that only elders can teach , but yes they have a lot of experience but anyone can treach who is having the knowledge of the particula thing
*TEACH N * Particular i mean
auh.. got it .. i agreed..
hmm... thnx

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No every one can teach but it depends upon the learner if the learner wants to learn something no matter what the source is whether the source is elder or younger , rich or poor . It depends upon the thinking .