Sidney Magal
Latin Lover
Game balance > realism. Always. That's why leaders live 6000+ years and units never die of age.
The leaders are really far off realism, but the units surviving (not in the early game when it takes 1000 years to move to the other side of the continent) and the case that people love of cavalries being upgraded to gunships are perfectly understandable if you consider the units as divisions rather than individuals. AFAIK, that is exactly what happened IRL. Some armies have centenary divisions and no one assumes it's the same guys who were there 200 years ago.
Sorry for the OT post guys.