Patrick Stewart. Patrick Stewart was 53 in Star Trek: The Next Generation - All Good Things... as 'Captain Jean-Luc Picard'.
Jonathan Frakes. Jonathan Frakes was 41 in Star Trek: The Next Generation - All Good Things... as 'Commander William Riker'.
LeVar Burton. LeVar Burton was 37 in Star Trek: The Next Generation - All Good Things... as 'Lieutenant Commander Geordi La Forge'.
Michael Dorn. Michael Dorn was 41 in Star Trek: The Next Generation - All Good Things... as 'Lieutenant Worf'.
Gates McFadden. Gates McFadden was 45 in Star Trek: The Next Generation - All Good Things... as 'Doctor Beverly Crusher'.
Marina Sirtis. Marina Sirtis was 39 in Star Trek: The Next Generation - All Good Things... as 'Counselor Deanna Troi'.
Brent Spiner. Brent Spiner was 45 in Star Trek: The Next Generation - All Good Things... as 'Lieutenant Commander Data'.
Denise Crosby. Denise Crosby was 36 in Star Trek: The Next Generation - All Good Things... as 'Lieutenant Natasha 'Tasha' Yar'.
John de Lancie. John de Lancie was 46 in Star Trek: The Next Generation - All Good Things... as 'Q'.
Colm Meaney. Colm Meaney was 40 in Star Trek: The Next Generation - All Good Things... as 'Chief Miles O'Brien'.
Winrich Kolbe. Winrich Kolbe was 53 in Star Trek: The Next Generation - All Good Things... as 'Director'