Those are guys in their late-60s\early-70s, old school, first-generation Italian-Americans or even Italian-born. Close to Junior.
They should also be called "lucky fellas" due to the fact that they managed to survive "the life" and getting old outside of prison.
Here's some of those who were later given a name and minor roles:

- Patrizio Blundetto (Uncle Pat)
Former soldier in the Soprano crew, worked alongside Johnny Boy Soprano. Pat is the uncle of Tony Blundetto and Chris Moltisanti. Tony Soprano calls him Uncle Pat but they are not blood relatives. Pat's brother Al Blundetto married Quintina the sister of Tony's mother. Pat owns a farm in Kinderhook, Upstate New York that his nephews used to visit in the summers of their youth. Several bodies were buried on the farm too (go figure)- Tony, Tony B., and Chris dug them up and moved them in 2004, as he was planning to sell the farm, and move to Florida, which he later does. In the series finale, Pat is seen visiting Junior in a New Jersey mental facility. He there encounters Janice, whom he suspects is attempting to con Junior into giving her the last of his money. Pat later visits Tony at the Bada Bing to report his niece's suspicious behavior, before going back to Florida.

- Giuseppe Scerbo (Beppy)
Seems very close to Uncle Jun. Accompanies him at the 1995 sit-down with Jackie Aprile.
Agrees with Junior on the need to kill Pussy Malanga and sides with Junior when Tony tries to persuade Junior into changing the planned location of the hit. Stands by Junior throughout his RICO trial and can often be seen in the courtroom. He also visits Junior in the asylum where Junior currently resides. Jos$eph Pucillo, the actor who portrays Beppy, is the uncle of series creator David Chase.

- Morfeo Lupo (Murf)
Former capo of Junior's crew, replacing Philip Parisi. After displaying signs of mental and physical enfeeblement that affected his capacity to run the crew's business, Junior had him replaced by Bobby Bacala.

- Thomas DiPalma
Elderly soldier in Junior's crew who is responsible for looking after him as his dementia worsens.
He allows Junior to wander out of the house.

There is also the dark and tall guy in the back...the credit just say "Gus"...then I found some info calling him "George Inzerillo" then again "George D'Agostino".