Unless you're one of those vintage bike experts who can identify things from insanely tiny details, you're probably in awe of those guys. As much of an admitted motorcycle history nerd as I am, I know I certainly feel that way. They're usually proud of their lifetimes of accumulated and arcane bike knowledge, and they absolutely should be.
At the same time, you'd kind of be a fool not to learn from them if and when you get the chance, especially if you're newer to a specific area than they are.
Take, for example, a couple of recent videos from the Bearded Mechanic. Motorcycling is a vast world, so just because you're pretty handy in your corner of it doesn't automatically mean you know everything. The smartest folks in our niche know this, and are happy to geek out about any expertise they might have, just to share both the joy and the knowledge.