i was disappointed to not only find out that there's a bunch of ages that don't give upgrades but also that there's even a max age after so many not-upgrades.
i was top for a while but got bored and went out for blood. raided a group of two unknowns successfully. had troubles finding my base. once i found it, i saw some guy in it, all my windmills clear, and he was building his own. he kept my spike doors there. i cleared him out and rebuilt.
then i went after the 2nd place guy. i tried to drop a spike on him but i had troubles getting the momentum back after that. i died