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Why would anyone *actively defer* to begin with? Wait for someone else to implement your idea?!
The reason to defer starting a startup is that if you start one and it succeeds, it will take over your life completely. And if that happens at 19, it cuts off a lot of options. http://www.paulgraham.com/before.html
On the other hand, the cost of failure at 19 also _feels_ much less because the opportunity cost is less (even if it maybe transitively not true).
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