Most of the people who go on sea voyages to this side of Antarctica are retirees (because it's expensive and you need five or six weeks of free time), and they

Most of the people who go on sea voyages to this side of Antarctica are retirees (because it's expensive and you need five or six weeks of free time), and they do perfectly well for themselves. The physically hardest thing about modern Antarctic travel is Zodiac landings. My issue with bringing kids is more about their inability to consensually weigh the risks than their physical capacity.