In Brooklyn Nine-Nine Season 6, Episode 8, title He Said, She Said, Captain Holt says the phrase
Zowie, I'm young!
to Terry and Boyle upon discovering the Disco Strangler is still alive (around 16 minutes into the episode, immediately after Holt receives a fax).
It isn't a phrase I'm familiar with, and I am unable to find anything online about it except for articles relating to this particular episode. However, the name "Zowie" strikes me as very odd, and I feel as though he is quoting something when he says this.
Is the phrase "Zowie, I'm young!" a reference?