I wouldn't call 1951 recently, From the link
"The name Silent Generation was coined in the November 5, 1951 cover story of Time to refer to the generation coming of age at the time".
I would question the start time of 1925 though, Someone born in 1925 would have been 18 in 1943 in which they could and would have fought in WWII.
TIME may have coined that term, in 1951, but it never stuck, no one else ever used it.And, no one called the earlier generations " PROGRESSIVE " or " MISSIONARY " at those times.
Being a WAR BABY, with a far better than average memory,who knew her grandparents and great grandmother, I can tell you from first hand knowledge, that this list is mostly garbage and historical revisionism.
Just because something is on the net, doesn't mean that it factual or true. :-)