Interestingly they're aging at 1 year per year, which is only a tiny bit slower than the people who live high in mountains who age at 1 year + epsilon (where epsilon is gravitational time dilation) per sea-level-year
I was curious how much altitude would affect aging so I did a quick google search. "The atomic clock calculated that for every 12 inches of elevation, 90 billionths of a second are added to a lifetime (79 years)"
