OptionalageTicks?: numberOptionalaggressive?: booleanClient-observable aggression state. This is true while a mob exposes an active attack posture or a synchronized neutral-mob anger state. It does not identify which entity the mob is attacking.
OptionalboundingBox?: BoundingBoxOptionaldisplayName?: TextComponentOptionalhealth?: numberOptionalitem?: ItemStackSnapshotOptionalmaxHealth?: numberOptionalmetadata?: JsonObjectOptionalowner?: EntityReferenceOptionalplayerName?: stringOptionalposition?: WorldPositionOptionalreference?: EntityReferenceOptionalrotation?: RotationOptionaltamed?: booleanOptionaltarget?: EntityReferenceOptionalvehicle?: EntityReferenceOptionalvelocity?: Vec3
For ageable mobs, as the client sees it: -1 for a baby, 1 for an adult. The real age and the breeding cooldown are only known to the server.