Newbie question

[Questi4110]

I have noticed that some of you advance to the next age without completely researching all scientific advancements. What is the criteria to advance to the next age?

[Harovan]

You need to have researched all advances of the old age, except those marked as "not necessary for next era", like Monarchy and The Republic. All techs, that bear this mark, are optional and can be left out.

[Questi4110]

ok thanks