There’s a kernel of truth, by the way, in that Rat Pack-era Frank Sinatra line about how he pities tee-totallers because when they wake up in the morning, they know that’s the best they’re going to feel all day. In terms of pacing your life, it might be a good idea not to optimise too early. If you’re in your twenties, perhaps you shouldn’t exercise too much or eat too healthily, since if you’re hyper-fit at 30, all you’ll experience is decline, pure decline. Whereas if you only start getting healthy later on you can, at least for a while, experience the feeling of water running uphill.