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Seems this might be once in a lifetime opportunity, go all out. Include psychological evaluations on each before and after. Have them write poetry, paint a painting an do multi-day intense rorschach test batterys. Have the ink blots become slowly more sexually themed. Have them do quantitised hot yoga. See who can hold their breath longer. Have them do indian leg wrestling as well as indian poker. Have them play marathon rock-paper-scissors battles under carefully monitored conditions. I'm talking a locked room, hidden cameras behind one-way mirrors. Have them guess how many fingers you are holding up behind your back. Have them try to balance a bloom stick on their nose. Have them watch a scary movie, then take a lie detector test where they must lie about how scared they were. Finally have them be featured on episodes of "wife swap" where they swap wives with eathother without telling their wives.

Basicly you need to watch the intro of the "6 million dollar man." https://www.youtube.com/watch?v=q-D99_UBhaU

I've got you beat. I've written a grant proposal that goes like this. Identical quintuplets as such: One is at 1g, another in space at 0g. One lives in a studio apartment built on a centrifuge gondola at 2gs. One will live at Michael Jackson's Neverland Ranch. And the last one will help his discouraged son get through college as a funloving and obnoxious rich businessman who enrolls as a student himself. http://www.imdb.com/title/tt0090685/

I guess I don't understand the "stress of spaceflight" Seems that there is a 5 minute exposure to ~4gs during the burn then 6 months exposed to ~0gs. You don't need to build bone or mussel mass.

Seems without the stress of gravity, the telomeres wouldn't tick as quick. I guess you will find out.