Others have discussed the time-dilation aspect, but there is also ongoing research into other physiological effects of spending extended periods of time in micro-gravity, some of which may have impacts on the aging process. The ability to spend long periods of time in space is pretty new and only a short list of people have actually done it, so the data is pretty limited. Far too early to say whether aging is affected, but that is something that they’re looking at, among many other things.
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