Simply done.
To calculate the troop capacity by space age is:
Take the number of barracks and multiply by the number of defensive towers.
Take the number of upgrades needed to reach space age add the length of a piece of string and hop on one foot while looking left. (For Romans, do this in sandals). Add the number of crowns you have to a large egg and half a cup of 97 by two fifths.
Then ask, what else could you have spent time thinking about instead of your troop capacity by space age and how anyone would have that answer.