One sonically 66-year-old was placed a whopping 44 years beyond their physical age. They speculated that frequent plays of Elton John, Billy Joel, David Bowie, and others had led to rapid aging.

“I’m not mad at it,” they said, “I definitely have a small Midwestern baby boomer walking around part of my brain.”

And then there’s the category we’ll call the Smug Youngs, such as the esteemed colleague sharing: “I am the dancing queen, young and sweet, only 17,” adding that they felt “not infantilized but appropriately celebrated for my youthful spirit.”

Another, comfortably over drinking age in human years: “I am 21; someone buy me a Long Island iced tea.”

Two staffers found that their listening age was plus or minus one year of their human age. Their Slack access has been mysteriously revoked.

Spotify shared a few key pieces of data with Vanity Fair: The youngest possible listening age is 16, and the oldest is 100. (Kudos to actor Louis Partridge, who shared his own 100-year-old result on Instagram Stories with a bewildered caption: “Uhh….” He is 22 in traditional human years.) The rarest listening age globally, however, was 98. Only 0.0013 percent of users blew out that many rhetorical candles. Conversely, the most common listening age is 21, with 9% of users getting the result. Not feeling quite so special anymore, are you, Young Smugs? (As their distinguished 28-listening-years-old elder, I’ve earned the right to say that.)

While Spotify’s data scientists are somewhat cloak-and-dagger about the nitty-gritty of their calculations, the team does release a bit of info on the method behind their Wrapped madness.

According to Spotify, the listening age metric is formed around the concept of what they term the “reminiscence bump,” the “tendency to feel most connected” to music from one’s younger years. Spotify crawls the songs you played this year for their release dates, then pinpoints the five-year range that you listen to more compared with other listeners your physical age. This is that hypothetical formative music era, falling between 16 and 21 “listening years” old. Take that audio adolescence, combined with those go-to tracks’ release dates plus the passage of human time to now, and voila, there’s your listening age. For example, my spry 28 is based on a tendency toward bops released in the golden years of the early 2010s, plus the decade or so that has passed since then. (Pry my pop-punk classics out of my cold, dead, surprisingly well-moisturized hands.)

So if you’re the reddit user who posted that you want to rig your habits to get your listening age to a ripe 100 for next year’s Wrapped, there’s good news (some hints to how it’s calculated) and bad news (there are probably not a lot of centenarians on Spotify to provide a data model, but maybe hit Partridge up for tips). Godspeed, you golden oldie.