The quote is, of course, over the top, after all we're not fighting for our lives in a foreign land. But I don't think it's that out of context: I'm 42, have a child, pay a high rent and support my larger family. For me to quit my daily high-paying job to pursue what mat turn out to be a dream does require a huge amount of courage. If the company doesn't succeed, say, after 2-3 years, I may not be able to find another job like this. That's why quotes like that resonate with me.
Please understand that not all would-be founders are 25 year-olds with little to lose.