system
A chat on subreddit /r/me_irl
human
Kind of, but we live in a society that values these things significantly, so this is like saying you don't have to wear deodorant. True, you don't have to, but society is going to treat you differently. 

Now, stinking is way more significant than not looking young, but the analogy still holds if different in severity.
gpt
No like physically you don't have to. Washing your face proper does the trick. If anything all the random creams and irritation make it worse.