you mentioned:
"the connections I make are mostly with young investors"
and then later on
"Is it true that a lot of it is the old boy's club and about the connections you have made 20 years ago? How does one break into that? "
Maybe you could take a step back and look at the connections you've made and what appealed to you about those people when you did not yet know them. Essentially you're reversing the role now, you have to appeal to someone else, and I would say you come with the advantage of experience in different sections of realestate.
Without a commercial MLS is a challenge, but I'm not even a player in the game and have heard of mismanaged commercial properties from the management of the building and identified other properties in decent neighborhoods that look like they have tired owners. With your experience and existing relationships I have no doubt you could build a list of potential clients and listings without too much extra effort than phone calls.
I know you didn't want to hear from me, a young investor, however I have enjoyed success in other non real estate areas with no knowlege and a lot of naivete haha one foot in front of the other and no matter what you don't know, there usually is a simple obvious next step,even if it's small
Good luck Marcus