In younger astronauts, Glenn said, the "aging" effect reverses itself when they return to Earth.

CNN: It's official: Glenn will return to space

Thus the total demographic effect of aging is attenuated by the absence of female workers in the older cohorts.

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This is the effect of aging population: millions more people will be eligible for Medicare, and healthcare costs grow as we get older.

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The benefits go far beyond the Duchenne muscular dystrophy, a disease that is diagnosed in only 600 American boys a year, to diseases like cancer and AIDS. Such drugs could even have a big effect on the muscle weakening that comes with aging.

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In six or seven years we time we net the effect of 18 to 20 years of esterification and aging.

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So is the aging of the population, creating more single widows and widowers, an effect that will grow as the baby boom retires.

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He hopes to learn, among other things, whether older people are immune to that effect, or whether it manifests itself in different ways in people who have already been through the aging process.

CNN: It's official: Glenn will return to space