There are more actors/actress from the TOS who has lived longer than most people from Babylon 5.
Living:William Shatner, March 22, 1931 (age 86)
Nichelle Nichols, December 28, 1932 (age 84)
Walter Koenig, September 14, 1936 (age 80)
George Takei, April 20, 1937 (age 80)
Deceased:DeForest Kelley, January 20, 1920 – June 11, 1999 (aged 79)
James Doohan, March 3, 1920 – July 20, 2005 (aged 85)
Majel Barrett, February 23, 1932 – December 18, 2008 (aged 76)
Leonard Nimoy, March 26, 1931 – February 27, 2015 (aged 83)
Grace Lee Whitney, April 1, 1930 – May 1, 2015 (aged 85)