With regards to the quote from ibn Mas`ood radi Allaahu ‘anhu about seeking knowledge from the senior scholars as opposed to the sighaar (the lesser ones), `Abdus Salaam ibn Burjis (d.1425AH) rahimahullaah comments:
And ibn Qutyabah rahimahullaahu ta’aala held the opinion that the sighaar (lesser ones) were the ones who were lesser in age. So he said about the narration of ibn Mas’ood mentioned above:
He (ibn Mas’ood) intended – that the people will not cease to be upon good as long as their scholars are the elders, and their scholars are not the youthful ones, because for the old man, the pleasure of youthfulness, and its self containment and its foolishness have disappeared from him. And he has taken on experience and knowledge as his companions.
So doubt does not come upon him in his knowledge; nor does desire get the better of him; nor does greed make him turn away and nor does Shaytan make him slip up with the errors of the young person. Thus with age there is dignity and honour and reverence.
And it may be these matters– matters which the old person is secure from – enter upon the youth; so when they enter upon him, and he gives fataawaa (Islamic rulings), he is destroyed and he destroys (others).
(to the end of his statement) 
(Awaa-iq ut talab of ‘Abdus Salaam ibn Burjiss rahimahullaah pages 24, translated by Nasser ibn Najam)