The only people I've ever heard say this are angst ridden teenagers, and they always take this as the whole truth. They drag their feet, trying to stall the onslaught of responsibility. 'Party as much as you can until it's time to let yourself die' they say. But in stalling, they cease to plan for a future they think they won't want. And in the end, they end up forced into the worst jobs, doomed to a fate they tried so feebly to escape. I'd laugh at the irony if I wasn't destined join them...