I wonder if calorie restriction works because it slows down your metabolism, and thus slows down cell division, and effectively makes it so you are just living more slowly/aging more slowly than other people. However, I would think you would also have less energy, and get less done. So effectively you would live longer as the calendar turns but you would not live any longer in terms of life experienced.
(this is all just pure speculation, I have never looked into any of the science regarding calorie restriction)
(this is all just pure speculation, I have never looked into any of the science regarding calorie restriction)