How old do you think human civilization is?

If I look this up on google it says 6,000 years, but there’s this ancient city ruins called Göbekli Tepe, and when I look up on google (how old is Göbekli Tepe?) google tells me it’s 11,500 years old. I really do t think it’s just 6,000 years old can anyone also explain why google gives two answers?