/instructions restart | Restarts the in-game guide that initially displays.

/instructions skip | Skips the in-game guide that initially displays.

/age cache clear global | Clears only the global cache for shared ages.

/age cache clear teams | Clears only the team cache for shared ages.

/age give @s modid:age | Gives the targeted player the specified age and its parent ages.

/age take @s modid:age | Removes the age and its parent ages from the targeted player.