The Ageless Enigma: How Old Is Momo Ayase's Grandma, Seiko Ayase, In Dandadan? (The Full Character Profile)

The question of "How old is Momo Ayase's grandma?" is one of the most persistent and intriguing mysteries within the *Dandadan* fandom, and as of December 14, 2025, the official answer remains a captivating enigma. This ambiguity is not an oversight by mangaka Yukinobu Tatsu, but rather a central, running gag and a key component of the character's unique charm, which has made her a fan-favorite alongside the protagonists Ayase Momo and Ken Takakura (Okarun).

The character in question is the powerful spiritual medium, Seiko Ayase, the guardian of the main protagonist Momo Ayase. While she appears strikingly youthful—often mistaken for a much younger woman—her true age is only ever hinted at through fan estimations and the logical assumption that she must be old enough to be the grandmother of a 15-to-16-year-old high school girl. This deliberate vagueness is deeply tied to her supernatural abilities and her role in the bizarre, comedy-action world of *Dandadan*.

Seiko Ayase: The Full Biographical Profile

Seiko Ayase is far more than just a grandmother; she is one of the most powerful humans in the *Dandadan* universe, serving as a mentor and protector to Momo and Okarun as they navigate the terrifying and hilarious world of Yokai and Aliens.

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• Full Name: Seiko Ayase (綾瀬 星子)
• Alias/Medium Name: Dodoria Santa (or Santaria Dodoria)
• Relationship: Grandmother and legal guardian of Momo Ayase.
• Estimated Age Range: Between 50 and 80 years old (Officially unconfirmed).
• Occupation: Professional Spiritual Medium and Exorcist.
• Key Abilities: Extremely powerful spiritual energy, ability to see and interact with both Yokai and Aliens, creating potent protective barriers, and advanced knowledge of occult practices.
• Personality: Aloof, cool, fiercely protective, and often nonchalant about the chaotic supernatural events occurring around her. She has a dry, dark sense of humor.
• Physical Appearance: Strikingly youthful with long, white hair (often dyed or naturally white due to her power) and a slender build, completely contradicting the typical image of a grandmother.
• Family Background: She comes from a long line of spiritual mediums, which explains Momo's own latent spiritual power.

Despite her motherly role, Seiko’s true power is immense. She is the anchor for the main characters, providing a safe haven and tactical advice against threats like the Turbo Granny and the Evil Eye.

The Mystery Behind Seiko Ayase’s Youthful Appearance and Age Range

The central question of "how old is Momo Ayase's grandma" is intentionally left open by Yukinobu Tatsu, making it a source of constant fan speculation. However, based on the established timeline and the age of her granddaughter, Momo Ayase (a high school student), Seiko must logically be somewhere between her early fifties and her late sixties to be a biological grandmother.

The fandom’s broader estimation, often cited as the 50 to 80 years old range, stems from the narrative's emphasis on her unbelievable longevity and vitality. Her youthful appearance is a significant plot point, humorously confusing other characters and serving as a visual indicator of her unique spiritual status.

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The manga hints that her power as a spiritual medium, which is strong enough to place protective barriers that ward off powerful Yokai, might be the source of her ageless look. In the world of *Dandadan*, characters who wield immense supernatural energy often defy normal human limitations, suggesting that her constant interaction with the ethereal form of spirits and her use of occult power has somehow preserved her physical body.

Seiko Ayase’s Role in the Dandadan Universe: The Family and The Fight

Seiko Ayase is a critical pillar in the *Dandadan* story, which blends elements of supernatural horror, science fiction (Aliens), and shonen comedy. Her home acts as the "Family" headquarters, a sanctuary for the main cast, including Momo, Okarun, Aira Shiratori, and Jin Enjoji (Jiji), as they fight to recover Okarun's lost parts and protect the world from various supernatural threats.

Her role as a professional spiritual medium, Dodoria Santa, gives her access to a vast network of information and resources in the occult world. She is often the one who provides the main characters with the magical tools, knowledge, and strategic advice they need to defeat powerful entities like the Dover Demon and the Acrobatic Silky.

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Her relationship with Momo is complex and loving, despite her strange profession. She raised Momo, who, ironically, initially only believed in ghosts and not in aliens, while Okarun believed the opposite. Seiko's influence is what grounded Momo in the world of spirits, preparing her for the chaos that ensues after her fateful encounter with Okarun.

The Topical Authority: Seiko Ayase and Dandadan’s Core Entities

To truly understand Seiko Ayase's importance, one must look at the key entities she interacts with and against in the world created by Yukinobu Tatsu. Her power level is consistently shown to be among the highest, often dealing with threats that would instantly overwhelm the high school protagonists.

• The Supernatural Balance: Seiko represents the human side's mastery over the supernatural. She is a powerful counterpoint to the terrifying power of the Yokai and the advanced technology of the Aliens.
• Turbo Granny: One of the most significant early villains, Turbo Granny, is a powerful spirit that Seiko helps Momo and Okarun manage, showcasing her expertise in exorcism and spiritual containment.
• The Ayase Family Line: Her role solidifies the concept of a "Family of spirit mediums." This lineage is a major source of the protagonists' strength and a key theme in the manga, suggesting that spiritual power can be inherited and cultivated.
• The Comedy Element: Her youthful appearance and casual acceptance of the absurd—such as a large, talking snail—is a major source of the non sequitur humor that defines *Dandadan*'s unique tone.

In conclusion, while the precise age of Momo Ayase's grandmother, Seiko Ayase, is a closely guarded secret of the *Dandadan* universe, the most accurate estimation places her between 50 and 80 years old. Her youthful vitality is a direct result of her immense spiritual power, making her one of the most compelling, powerful, and mysterious characters in the entire series.