I just completed the 7 stars for the Ancient Era and noticed I was unable to receive fame for completing additional ones (with the exception of the money star, which I just completed). Bug or working as intended? I know in the Neolithic Era, we could farm more.

The fame is there, as hitting the stars will make your fame counter increase. At least from my experience: That's just an interface bug.

If nothing changed since Lucy and victor opendev: Fame does degrade over time, but the bottom limit is 100 fame.

Thank you, Changlini. I was just coming back to report that after ending my turn, the fame showed back up. Maybe just an interface bug on the turn it completes. 

edit: Confirmed it's working as intended. Received another star and the fame.