thanks for clearing that up twickster - I thought there was something else they had in common (maybe there is.
Okay here’s another 4 people:
**
An easy one:*
Val Kilmer, Mel Brooks, Burt Lancaster, Ben Kingsley, Charlton Heston
An almost as easy one:*
Ryan O’Neal, Lord Laurence Olivier, Edward G. Robinson, Martin Sheen
A middle one:
novelist Saul Bellow, Anthony Quinn, Ernest Lehman (screenwriter: Hello Dolly!, North by Northwest, Black Sunday), James Doohan
A harder one:*
juliette Lewis, Kate Beckinsale, James Earl Jones, Eric Bana (other than, or at least more specific than, the fact that they are all actors)
*While it has to do with the fact “they’re all actors”, the answer is far more specific than that
Dentists? I know Holliday and Buchanan were.
Yes Sampiro - no need for the spoiler box now - all 4 were dentists.
As for the easiest of the questions you posed, Charlton Heston, Ben Kingsley, et al have portrayed Moses. In Val Kilmer’s case it was the voice of Moses but Moses nonetheless.
I guess I won’t post any new ones now that there are 3 more of yours still unanswered (assuming I was right of course). 
Just 1 more thing - I suppose we don’t have to limit this to people right?
(Quick Example 2, 17, 19 and 8675309)
Prime Numbers
Jean-Luc Picard, Monica Seles, Nero, and Edmund I
No, do whatever you wish. I’ve got one that mixes people, abstract concepts and countries going…
They’ve all been in World War II movies, and I think they’ve all played Nazis… am I close?
They all were stabbing victims.
Oral Roberts, Jimi Hendrix, Cordell Hull, Lena Horne
Yep. Damned if I can figure yours out, though. 
For those who like these kinds of puzzles, there’s a quiz show on NPR called Says You! It’s sort of like *
Wait, Wait, Don’t Tell Me*, the same panelists each week and the questions, while interesting themselves, launch some very funny digressions.
From their Common Threads category:
Banjo, Bartok and Bloodsucker
Tony Kahn: “Those are my attorneys.”
Each week, more radios are tuned to Says You! than any other appliance.
And one of my own:
George Lazenby, Benjamin Harrison and Hugh Downs
All claimed Native American ancestry?
H.G. Wells
Vasco da Gama
Chaucer
Plato
Marco Polo
X, Xv, Xi, Xii, Xxiii, Vi, I, Ii, Xvi.
Those should be all caps:
X, XV, XI, XII, XXIII, VI, I, II, XVI.
The number of popes to have chosen particular names. Off the top of my head…
Pius XII
John XXIII
John Paul II
Benedict XVI
and I can probably find a site to check the rest.
Looking at the way they’re ordered, I’d be willing to be it’s actual more like the numeral designations of the last 9 popes.
Ooh, yes, that’s probably right. Good job.
[sub]Every time I see your user name, with that apostrophe in there, it looks like I’m supposed to tell Mel something.[/sub]
Right! All the popes in the past 100 years.
Actually I was going for Mafia- they were all considered for major roles in The Godfather.
Answers to others:
They all became fathers in their 80s.
They have all appeared in movies in which Nick Nolte played their father (Cape Fear, The Golden Bowl, Jefferson in Paris and Hulk, respectively)
Obviously I haven’t seen Jefferson in Paris, but trying to picture Nick Nolte playing James Earl Jones’ father hurts my brain