hmmm... I think you want to have some time frames and villagers population references right? Here's what I do normally (when I do not tool rush in a no water map).
Stone age: Crank 20-24 villies, depending on food availability and if I want to have a faster tool age or not...
Tool age: Crank 0-4 additionnal villies (to reach 24) and wait for bronze
Bronze age: Crank villies non-stop with many town centers until I have ~50 villies (assuming the population limit is 100+).
Iron age: Do not crank any villies. Might renew some dead villies though. I click iron in average at 30 minutes...