Being in Charge

Since our general manager's last day was Friday, when the owner of my office is out, I'm the one in charge now. Me, the youngest person in the office. I'm finding it very odd that people in my office, some of whom are twice my age, are telling me that they want to leave an hour early, and they are trying to justify it to me. I don't care; I trust them to be responsible; they are adults and in addition to being much older than me, have worked for the company longer. I guess I'm not meant to be the boss.