This should be stereotyping because it would be implying that all people of that age, occupation, race, or similar, are the same and belong in the same group.
To comport is to act a certain way, or carry yourself in a certain way. The greek root "port" means carry
There’re lot of errors in the question. Anyways the answer are: who’s at the door, he hasn’t let me know the date, you’d never know she struggles with her confidence and I could’ve been a contender
The logical fallacy can be deepened depending on your morals, but the logical fallacy is the world "should". This implies that living together before marriage is the only way that a marriage should work out, or that it is the "right" way. Both of those assumptions are false, because traditionally (typically the "right" way), couples would not live together before marriage, and many couples had their marriage work out perfectly without this.