If you downloaded the standalone client you will need to use
UnRen to decompile your files before following these instructions.
For pose:
In LR2/game/major_game_classes/character_related/Person.rpy on line 1229 simply remove the undesired poses from the list as defined
self.idle_pose = get_random_from_list(["stand2","stand3","stand4","stand5"]).
For age:
In LR2/game/major_game_classes/character_related/Person.rpy on line 41 change the assignment
_initial_age_ceiling = 50 to whatever maximum age you prefer.