I have got to say I agreed with everything he said
Re the age thing...
I think what he was saying is that the ARTIST needs to be of an age to "sell" the song
A 15 year old could write a song like "I will always love you" but could they really "sell it"
The same goes for a 50 year old writing a song like "call me maybe" - I think they could easily write it but would not be able to "sell" a performance of it, whereas a younger person could
This, for me, is the beauty of writing songs for other people to perform
Also, I really like the distinction (and metaphor about cooking) regarding "singles"
The same needs to be considered for those pitching - artists are only looking for "hit singles" (NOT album tracks) so everything he says about singles is relevant for those of us pitching
Good info and good find RockingSnowman - thanks for posting