Depends upon what it is about. For example, listening to 30 year olds about college is probably more relevant than listening to 50 year olds, because things changed in that 20 years between when they went to college and many of the lessons and struggles are fresher in the minds of the 30 year olds. On the other hand, I'd give more weight to marriage advice from a 50 year old who has been married for 25 years compared to a 30 year old married for 5.