Is there a mod that...

[MRT144]

Is there a mod that gives vanilla civ a longer early game period? Im so tired of blowing through the first 150 turns only to get to a long middle late game. maybe a mod that changes the start date and stagnates technology growth...

[Boco]

Not sure it's quite what you're after, but have you tried Kull's Seeds of Greatness? IIRC, it starts in the bronze age and ends sometime around 250BC. It's a fun one.

[Panda]

just edit your rules.txt and change the tech paradigm (under @COSMIC) from 10 to a higher value; slows down the research rate but will penalise you heavily earlier on when you have few cities.