A fortune cookie I suspect.

More seriously, I was also curious. A quick search seems to say the earliest recent source is https://x.com/_NathanCalvin/status/2084856543561093535

Nonsense, this is just folk wisdom. Ask your parents.

	▲	swiftcoder a day ago \| parent [-]
		I have a feeling this one falls in the same category as "sweet summer child", which, while technically as old as the hills, only hit critical mass after game of thrones popularised it