<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def StartingAgeEnum(ctx):
 """Starting Age Enumeration."""

    return Enum(
        ctx,
        what=-2,
        unset=-1,
        dark=0,
        feudal=1,
        castle=2,
        imperial=3,
        postimperial=4,
        dmpostimperial=6
    )