There need to be Age vices

Extremely Immature
Slightly Immature
Young
Vices which decrease command, acumen, influence and happiness but may improve health.

Senior
Aged
Extremely Aged
Vices which decrease health and command but may increase acumen and other things.

These vices would add realistic effects of aging, and would help the old generals develop health problems and die, and would give problems to young generals and kings. Since rebel uprisings occur due to immature royals coming of age, the low command and acumen may assist in the crushing of the rebellion.