Michael Dorn may be 61, but dont forget that Patrick Stewart was no spring chicken when he first commanded the Enterprise back in 1987. So the age of the lead actor is not a huge issue. Besides, a new Star Trek series would probably work best if the show took another bold leap into the future, just as TNG (The Next Generation) did from the TOS film franchise. Real world technology has improved and society has changed, so this option probably works best from both production and audience standpoints. The leap in time neednt be quite as great as the gulf between the respective eras represented by Captains Kirk and Picard, but even if it were, Worf would still be around (and probably be as tough as ever). One thing that has been well established by Star Trek continuity is that Klingons, like Vulcans (and other non-Human species), can live for a really, really long time. The Klingon Commander Kang (Michael Ansara), for example, first appeared in the TOS episode Day of the Dove in 1968, which is set in the year 2268. He then appeared in the Star Trek: Deep Space Nine episode Blood Oath, which was set in 2370. Kang was still alive (and peddling his uniquely Klingon brand of mischief) 102 years after his first appearance. The same is true for other Trek favorites Koloth (William Campbell - who first appeared in TOS classic The Trouble with Tribbles and returned once more in Blood Oath) and, perhaps most notably, Kor (John Colicos), who first appeared in the 1967 TOS episode Errand of Mercy and somehow survived DS9s Blood Oath in order to return twice more in the DS9 episodes The Sword of Kahless and Once More Unto The Breach. So yeah, age is not an issue for Klingons (nor is visible ageing much of a problem for actors encased in heavy prosthetics). As an aside, we already saw an older looking Worf in the TNG finale All Good Things... and this is the image longtime fans will likely summon in their heads when they picture him as a future Captain.