Neil wrote...
Since Spacefall implies some measure of time dilation through faster- than-light travel, it might be that habitual spacefarers (such as Jenna and Tarrant in paticular) might be physically younger than their birth date indicates. If this is so, then such people would in fact have two ages - a biological age, and a chronological one.
I rather like that idea. Given what we're told about Tarrant's history he does look unreasonably young.
Leia