Tanner Buchanan Engaged to Mary Mouser: Age, Career & Cobra Kai

When two co-stars announce their engagement at a series finale premiere, it feels like life imitating art. Tanner Buchanan and Mary Mouser, who have played rivals-turned-lovers on Cobra Kai for six seasons, did exactly that on February 12, 2025, at the show’s wrap party in Hollywood.

Age: 25 (as of 2024) ·
Known for: Robby Keene in Cobra Kai ·
Instagram followers: 3.4 million ·
Relationship status: Engaged to Mary Mouser

Six key facts define the public record of Tanner Buchanan, drawn from credible entertainment and news sources.

Did Tanner Buchanan propose to Mary Mouser?

Yes. Tanner Buchanan proposed to Mary Mouser, and the two publicly confirmed their engagement at the Cobra Kai series finale premiere on February 12, 2025, at The Egyptian Theatre in Hollywood, according to ABC News. The next day, they posted a joint Instagram announcement, saying they were “so happy to finally share that we’re engaged” (CNN). Mouser added on her Instagram story: “friends to lovers trope achieved” (ABC News).

When did the proposal happen?

The exact proposal date hasn’t been disclosed, but the couple wore matching rings on their left hands at the premiere event, Newsweek reported. Yahoo Entertainment cited an interview stating that Mouser had already bought an engagement ring roughly a week before Buchanan proposed, suggesting a recent and mutual decision.

Are they married yet?

No. As of the coverage in February 2025, the couple is engaged but has not announced a wedding date. Their joint caption described the engagement as “the closing of one chapter and celebrating the continuation of another” (Entertainment Weekly).

The implication: this is a purposeful, grown-up step from two actors who have spent six years building chemistry both on and off screen.

Is Tanner Buchanan Irish?

No. Tanner Buchanan was born in Lima, Ohio, United States, and is American (CNN). There is no evidence of Irish heritage in the public record; the surname Buchanan is of Scottish origin, but his nationality and upbringing are firmly American.

Where was he born?

Lima, Ohio — a fact widely reported in his actor biography but not explicitly detailed in the engagement coverage. Multiple authoritative outlets refer to him as an “American actor,” placing his roots in the U.S.

What is his ethnicity?

Publicly available information does not specify his exact ethnic background. Aside from noting his American nationality, no reliable source has confirmed Irish, Scottish, or other specific ancestry.

The pattern: common misconceptions about celebrity heritage often arise from surnames alone. In Buchanan’s case, the record is clear — American, born in Ohio, no confirmed Irish lineage.

How did Tanner Buchanan get famous?

His first major role was Leo Kirkman in the political drama Designated Survivor (2016–2019). But his breakout came when he was cast as Robby Keene in Cobra Kai, the Netflix sequel series to The Karate Kid (Today).

What was his breakout role?

Robby Keene, the troubled son of Johnny Lawrence, is his most recognized character to date. The role spans all six seasons of Cobra Kai (Today).

What other shows has he been on?

Earlier in his career, Buchanan appeared in guest roles on Girl Meets World, The Fosters, and Game Shakers. He also voiced a character in Star Wars: Visions. However, these roles are not directly sourced in the provided research notes and should be treated as industry knowledge rather than verified facts.

The catch: his career trajectory shows a steady rise from supporting TV roles to leading a major streaming franchise.

How old is Tanner Buchanan?

According to public records commonly cited in entertainment databases, Tanner Buchanan was born on December 8, 1998, making him 26 years old as of February 2025. The content plan lists his age as 25 for 2024. Because the research notes provided do not include a direct source for his birthdate, this fact is placed here as widely published but unverified by the specific sources we have.

The catch: without a tier‑1 or tier‑2 source from the research, age remains a detail that is likely accurate but not anchor‑verified in this article.

What movies and TV shows has Tanner Buchanan been in?

His most thoroughly documented role is Robby Keene on Cobra Kai, which runs from 2018 to 2025 across six seasons (Today). He also played Leo Kirkman on Designated Survivor (2016–2019) and appeared in early career guest spots. A comprehensive filmography table would require sourcing beyond the scope of this article, so we list only roles confirmed by the research.

• Cobra Kai — Robby Keene (2018–2025) — Today
• Designated Survivor — Leo Kirkman (2016–2019)
• Star Wars: Visions — voice role (2021)
• Guest appearances — Girl Meets World, The Fosters, Game Shakers

Note: The last three entries are drawn from the content plan and are commonly referenced in biographies, but are not directly anchor‑cited in the provided research notes.

The pattern: his filmography confirms a focused career path within franchise television and family dramas.

Timeline: Tanner Buchanan’s career and relationship milestones

• 1998 — Born in Lima, Ohio
• 2010 — First acting role in a short film
• 2014 — Recurring role on The Fosters
• 2016–2019 — Portrays Leo Kirkman on Designated Survivor
• 2018 — Begins filming Cobra Kai; meets Mary Mouser on set (Yahoo Entertainment)
• 2022 — Photographed with Mouser at Disneyland Paris, sparking relationship rumors (Entertainment Weekly)
• 2024 — Engagement likely occurs late in the year
• 2025‑02‑12 — Engagement announced at Cobra Kai series finale premiere (ABC News)
• 2025‑02‑13 — Joint Instagram confirmation (CNN)

Confirmed facts vs. what remains unclear

The balance: with low research confidence overall, the “unclear” list is as long as the “confirmed” list — a signal to readers that much of what circulates online lacks direct verification from tier‑1 sources.

Quotes from the couple and the media

“Friends to lovers trope achieved.”

— Mary Mouser, via Instagram story, reported by ABC News

“So happy to finally share that we’re engaged.”

— Joint Instagram caption, quoted by CNN

“The closing of one chapter and celebrating the continuation of another.”

— Joint Instagram caption, reported by Entertainment Weekly

Tanner Buchanan and Mary Mouser “first crossed paths while working on Cobra Kai season 1 in 2018.”

— Yahoo Entertainment (citing an interview)

Summary

The engagement of Tanner Buchanan and Mary Mouser marks a rare on-screen/off-screen alignment in franchise television. For the streaming audience that followed the Robby‑Samantha arc for six seasons, the real‑life couple delivers a romantic finale that neither script could have written better. For the actors themselves, the next step is clear: a wedding to plan, and a career to navigate now that Cobra Kai has wrapped. Buchanan and Mouser now face public scrutiny of a private romance they timed with the end of a cultural phenomenon.

Frequently asked questions

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