We all have some FB friends that are younger than us, but let's take pretentious to a whole new level so we can lambaste ANYONE. Instead of saying, "I'll tell you when you're older," to passive aggressive rhetorical ramblings that end in questions like "Why does this always happen to me?" say::
"I'll tell you when you're more emotionally mature."
Then do a follow up post:
"You're an idiot."
Friend problem solved.