I would assume fans think "Admiral Archer" is indeed an elder Jonathan because of the mention of the beagle. We know of Porthos. Now it obviously could have been a different beagle that Admiral Archer owned, but a beagle nonetheless. Plus in The Next Generation we saw an incredibly aged Leonard McCoy and it has been established that life expectancy in Star Trek is somewhat extended than what we have currently.
I read the latest issue...thought it was pretty good, an interesting take on an old classic. Also was it just me, or did the art look slightly different in this issue?