I feel like that's pretty impressive for a show that ended almost 30 years ago. Even the later Deep Space 9 has lost at least 1 by this point, René Auberjonois. And granted it aired 20 years earlier, but all but 3 of the Original Series mains have passed away.
Here's all of their current age status, oldest to youngest:
Patrick Stewart: 82
Brent Spiner/Gates McFadden: 73
Jonathon Frakes: 70
Michael Dorn: 69
Marina Sirtis: 67
LeVar Burton: 65
Wil Wheaton: 50
Even the "baby" of the cast is a half-century old now :chomsky-yes-honey:
Brent Spiner as an old man doesn't parse in my brain, and I've seen the one where he plays Soong
Huh he's aged pretty well actually, good for him