Veterans are looked up to by the young guys and are usually the leaders in the clubhouse. They have seen most everything and bring a presence to the clubhouse that keep the order threw the good times and bad, through the weekly grind of a MLB season which is 42 games longer than the minors. In other words they have been around the block and can raise the bar for the younger players and answer there questions.
And if your specifically asking about Molina and Pujols they are 2 hall of famers who have played in 41 MLB seasons combined and 21 Allstar game appearances combined. Trust me the young guys looked up to them.