“So how old do you think the earth and universe are?”
Perhaps you should ask yourself why you’re asking that question.
I could be wrong, but I ask you that question because I have a pretty good idea how you would answer it. If my hunch is right, your answer would put you in a deeper hole than you've already dug for yourself. If I'm wrong, then I apologize in advance.
What hole? You’re the one saying people come from monkeys, and ultimately fish & then dirt. That’s totally against the Bible and real science, and you can’t reconcile the two.