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.
It depends on the context but generally less meaningful and sometimes less relevant. One hasn't really had time to fully absorb certain "life lessons" until they've had the benefit of years and therefore other additional experiences to provide more contextually relevant information. Consequently advice derived from such immaturity isn't necessarily as meaningful or relevant.
I think the parent's glibness is a bit much, though.
