Loose Lips

I hear my new assistant is a great man at a party
which may be the reason why he is so often tardy.
Describing my proboscis is his favorite party schtick.
Plus, speculating over what makes his bossman tick.
He thinks I’m ancient in my forties and lists all that I lack?
He can tick “spineless” off of his list when I give him the sack!

Prompt words for today are party, ancient, proboscis, describe and assistant.