The mentioned lifespans are for humans only. Fehls are immortal while other races are either immortal or have different lifespan schemes.
Humans:
Lesser Emissary - 100 years
Core Emissary - 120 years
High Emissary - 150 years
Archon - 200 years
Exarch - 500 years
Astral Master - 2000 years
Hierarch - 5000 years
Thearch - Immortal
Fehls:
Fehl Mutant
Fehl Beast
Fehl Daemon
Fehl Noble
Fehl Lord
Fehl Prince
Fehl Overlord
Fehl Origin