How Old Is Lieutenant Mariner In Star Trek, Anyway?

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Warning: SPOILERS for Star Trek: Lower Decks Season 4, Episode 9 - "The Inner Fight"
Summary

Lt. Beckett Mariner is likely older than her friends on the USS Cerritos, indicating she should be of a higher rank.
Mariner attended Starfleet Academy with Nicholas Locarno, Wesley Crusher, and Sito Jaxa in 2268, and was devastated by Sito's death in 2271.
Mariner has served on multiple Starfleet ships, including during the Dominion War, and has ties to characters from Star Trek: TNG and DS9. She could have a higher rank, but chooses to remain a Lower Decker.

Star Trek: Lower Decks' Lieutenant Beckett Mariner (Tawny Newsome) has lived an incredible life in Starfleet, but how old is she, anyway? Mariner was promoted to Lieutenant, junior grade - her second jump up to that rank - at the start of Star Trek: Lower Decks season 4. But based on her experience, skill set, and knowledge, Beckett should actually be of a much higher rank, and new information indicates Mariner is older than her friends on the USS Cerritos.
In Star Trek: Lower Decks season 4, episode 9, "The Inner Fight," Mariner's erratic and self-destructive behavior - extreme even for her - worried her mother, Captain Carol Freeman (Dawnn Lewis), and her best friends, Lieutenants Brad Boimler (Jack Quaid), D'Vana Tendi (Noel Wells), Sam Rutherford (Eugene Cordero), and T'Lyn (Gabrielle Ruiz). Boimler, Tendi, and T'Lyn took Mariner to a routine repair mission that saw them stranded on the hostile world of Sherbal V, which was where various aliens from non-Federation ships were banished by Lower Decks season 4's big bad, Nicholas Locarno (Robert Duncan McNeill). But Mariner's shocking confessions to Ma'ah (Jon Curry), a Klingon she fought and befriended, offer new contextual clues about Beckett's life and actual age.

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