Franklin said:
Well and good that kids from genetically engineered parents circa the 1990s age faster. Frankly, I find it simply convenient more than believable, but eh. I mean, they what, stop aging quickly around 15? 20? 35? Montalban was around 46 in "Space Seed", so Khan was only 23? It's a "dog's years" thing?
Of course, I think we all know the practical reason for it all is Montalban was 63 at TWOK, so if everyone on Khan's crew was an original "Botany Bay" survivor, that would've been an interesting looking bunch to say the least.
You're thinking too conventionally.
Don't think of it as accelerated aging, think of it as accelerated maturation.
While humans are children, our growth, and aging certainly occur at a much more rapid rate then at any other time in our lives. In a mere 15 years, a human child goes from being a 15 inch long, 8 pound, helpless creature, to being nearly full grown, with a sense of ethics, and basic skills. At no other point in a humans development will they advance so quickly. In nature, this development "shuts off" when full growth is achieved, and never are our minds such active sponges as when we're in our youth.
Since these are certainly facts, I see no difficulty in accepting the premise that "advanced" genetic manipulation could result in even quicker maturation, along with an extended period of being in peak physical shape.
Basically; Much quicker aging then normal in the beginning, and much slower aging then normal after maturing.
That said, Khan is flying around in the "Reliant" with a ship full of mostly 15 or so year olds. Kirk has a right to defend himself and the "Enterprise", but he's fighting a crew who are essentially "jacked-up" children led by their elder. Aren't there moral implications here? Are they kids or adults? Is Joachim a genetically superior teenager or a 30-something? Shouldn't that question have mattered in how the situation was dealt with?
These moral implications are predicated on an assumption that these "15 year olds" don't possess the intellect, and ethics necessary to understand their actions. When dealing with beings not of natural human development, its illogical to impose natural human limitations.
They were 15 standard Earth years of age, yet they clearly had the intelligence, and maturity far beyond their years.