How would we act if humans worldwide had an average life expectancy of only 30 years?

Hmmm. Good question. I think we would all act differently. I suppose some people would never even have kids. While others might try to have more. Me? If I knew that I was only going to live to be 30. . .Well, I guess that I would still of had my two daughters but we would have done a whole lot more. More camping trips, more movies, more ice cream, more picnics at the beach, etc. And if I had had a son, I would have told him "Run, Logan! Run!"