To put it another way, how far through the experience tree can a unit progress in each age?
2 Answers
The amount is unlimited. You can have level 15 warriors in the ancient era, in theory.
You might have been confused by the fact that a unit with 30 XP or more cannot gain any XP from barbarians... but this is independent of era.
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Not sure this is correct, just had a unit at level 14, trying to level to level 15, and it wouldn't go beyond exactly 1k exp, I was attacking a city state, possibly against a player it would go higher, or it might just be early units have a cap, since it was a chariot still.– user26651May 30, 2012 at 20:44
Level 15 is the highest. You can keep gaining XP though.