Suggestion for a further experiment
We should try this on young *and* old people. I suspect a strong correlation between what age one believes one is, and one's actual age. If so, this would prove that thinking one is young actually keeps one young, while thinking one is old would cause aging to occur.
Ergo, we would have the evidence we need to strike back at a society that is constantly telling our old people, "you're old". It's amazing to think that the social consensus is actually responsible for aging and death and that - just by changing social attitudes - we can achieve racial immortality.