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turchin comments on A Map of Currently Available Life Extension Methods - Less Wrong Discussion
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Also the statistical difference in 12 years is still strong in this case as Hompertz curve is much steeper in 90th that in 70th.
For example, after 100 a person has the probability to die 50 per cent a year. In this case gaining several years is very unprobable event. For example for 91 years old person to survive until 103 has probability around 1 in 1000.
The statistic for twins is also probably distorted by earlier deaths of most twins (like 65 and 71) - because most people die earlier than Hompertz curve is not so steep.
I agree that it is some support, but I do not have any knowledge of the statistical distribution of differences between twins deaths. I would assume that there are enough twins that such a large difference is not terribly unlikely to happen just by chance alone.
However, it's quite clear to me that you are more informed about this than I am, so it would be nice if you could point me toward some resources with stats on this.