Anyone who is inactive, fat, or pleasure-loving should obviously be barred.
To be German or Spanish would be good.
A life spent on horseback, in between sailing often to the Indies (thus becoming inured to a diet of hard tack, garlic & dried fish) would put you into the highly recommended category.
But the best space travellers would be ‘dried up old crones who since childhood have ridden over great stretches of the earth at night in tattered cloaks on goats or pitchforks’.
I have put my name down.
Link
Kepler's Dream
Related post
Quantum history
Kepler's Dream
Related post
Quantum history