Global Ages modifiers are various country modifiers, which apply to every country, based on the Age the game is in; they exist in Extended Timeline to simulate the differences between the various historical eras.
The transition from one Global Age modifier to the next will not happen until the the first day of the month following the apparition of a new Age (i.e. if you reach Late Classical Age on the 14th of July, you will keep the Classical Age Global Age modifier until the 1st of Augustus; on the 1st of Augustus the Classical Age Global Age modifier will disappear and the new Global Age modifier will be Late Classical Age).
Classical Age[]
The Classical Age has the following Global Age modifier (which is called "Classical Age"):
Effects:
- Development cost: +220%
- Naval force limit modifier: -50%
- Discipline: -10%
- Envoy travel time: +20%
- Culture conversion cost: +120%
- Tribal Development Growth: -1.00
Late Classical Age[]
The Late Classical Age has the following Global Age modifier (which is called "Late Classical Age"):
Effects:
- Development cost: +200%
- Naval force limit modifier: -50%
- Discipline: -10%
- Envoy travel time: +20%
- Culture conversion cost: +100%
- Tribal Development Growth: -1.00
Migration Age[]
The Migration Age has the following Global Age modifier (which is called "Migration Age"):
Effects:
- Development cost: +175%
- Naval force limit modifier: -40%
- Discipline: -10%
- Envoy travel time: +20%
- Culture conversion cost: +80%
- Tribal Development Growth: -1.00
Dark Age[]
The Dark Age has the following Global Age modifier (which is called "Dark Age"):
Effects:
- Development cost: +150%
- Naval force limit modifier: -40%
- Discipline: -7.5%
- Envoy travel time: +20%
- Culture conversion cost: +80%
- Tribal Development Growth: -1.00
Feudal Age[]
The Feudal Age has the following Global Age modifier (which is called "Feudal Age"):
Effects:
- Development cost: +125%
- Naval force limit modifier: -30%
- Discipline: -7.5%
- Envoy travel time: +20%
- Culture conversion cost: +80%
High Middle Ages[]
The High Middle Ages has the following Global Age modifier (which is called "High Middle Ages"):
Effects:
- Development cost: +100%
- Naval force limit modifier: -30%
- Discipline: -5%
- Envoy travel time: +10%
- Culture conversion cost: +60%
Late Middle Ages[]
The Late Middle Ages has the following Global Age modifier (which is called "Late Middle Ages"):
Effects:
- Development cost: +75%
- Naval force limit modifier: -20%
- Discipline: -5%
- Envoy travel time: +10%
- Culture conversion cost: +40%
Age of Discovery, Age of Reformation, Age of Absolutism, Age of Revolutions[]
Those are the Vanilla EU4 Ages and therefore have no Global Age modifiers.
Industrial Age[]
The Industrial Age has the following Global Age modifier (which is called "Industrial Age"):
Effects:
- Development cost: -10%
- Land maintenance modifier: +20%
- Technology cost: +10%
- Leaders without upkeep: +1
- Diplomatic relations: +3
- Siege ability: +50%
- Envoy travel time: -40%
- Culture conversion cost: -15%
Great War Age[]
The Great War Age has the following Global Age modifier (which is called "Great War Age"):
Effects:
- Development cost: -20%
- Land maintenance modifier: +40%
- Technology cost: +20%
- Leaders without upkeep: +2
- Diplomatic relations: +5
- Siege ability: +75%
- Envoy travel time: -60%
- Culture conversion cost: -30%
Information Age[]
The Information Age has the following Global Age modifier (which is called "Information Age"):
Effects:
- Development cost: -30%
- Land maintenance modifier: +60%
- Technology cost: +30%
- Leaders without upkeep: +2
- Diplomatic relations: +6
- Siege ability: +100%
- Envoy travel time: -80%
- Culture conversion cost: -30%