The secret of a long, alert life is probably as important as the secret to a long life. To live to 100 and be able to say you feel more intellectually able than when you are twenty is quite something. Even doing that till 85 would impressive.
I found it interesting that the Sciam article about these substances was published when she was already 70. Probably she had studied them before, but still, I guess she was still very active by 70.
