I can vouch that they learn from watching an 'elder'. When my older boy Skip goes away contract lambing (my BIL borrows him for a few weeks every year), it leaves me and youngster Dot to do all the work back here. Every year I am amazed when Dot 'just knows' how to do jobs that hitherto I always sent Skip to do, because he was the dog knew how to do it. Dot being Dot, and very much her own dog, she does it Dottie's way, but in truth that's often an improvement - and does really demonstrate that she's understanding the job, not just the actions.
I remain in total awe of a collie dog's intelligence, application, loyalty and work ethic.