just as with fae and vampires, stars, or angels, would likely not age like normal humans do either
Revelations 8:10-11 "The third angel sounded his trumpet, and a great star, blazing like a torch, fell from the sky on a third of the rivers and on the springs of water— the name of the star is Wormwood. A third of the waters turned bitter, and many people died from the waters that had become bitter." The Gargoyle makes the Tonic, we know that juniper berres were used and thus it was likely a very "bitter" concoction.
"Avery Etidorpha Wormwood" is an alias that we know the Gargoyle used on a few occasions. Now it may seem naïve of me to claim that someone who openly uses the name "Wormwood" may also be the same biblical entity assocated with the herb, but I would argue that ignoring such a factor is counterintuitive to the eventual answering of the question; Who is the Gargoyle? They chose this alias and I think that means something. Maybe it just means wormwood is a well-loved ingredient in the botanical community, or maybe its an ode to one's past, a simple, secret nod to the exceptionally complicated role of an angel who fell to earth. Leaving such a glowing stone unturned could surely be one's great hamartia