Does anyone know the time frame in which the Celts(Druids), Maya, Inca, Aztecs, and Egyptians lived?

I've been researching since days--and it seems that there are unclear or no time frams for these groups of people. I might have overlooked it--I found that the Maya lived around 3000B.C. until 780A.D., but I couldn't even confirm this. I was trying to find websites with data and pictures, but there seems to be little out there--or I went to the wrong sites. Anyone willing to supply some data for me? Thank you!!