As a boss monster, Asriel Dreemurr is technically 11 years old, as stated by Nova. However, it is important to note that his true age is much older, taking into account the time he spent as a flower.
In the game Undertale, Asriel Dreemurr is initially introduced as the son of King Asgore and Queen Toriel, and the adoptive sibling of the main protagonist, Frisk. As a boss monster, Asriel possesses immense power and is the final boss of the game’s “True Pacifist” route.
To understand Asriel’s age, we need to delve into his backstory. As a child, Asriel and his adoptive sibling, Chara, climbed Mount Ebott and fell into the Underground, a world inhabited by monsters. Tragically, Chara died shortly after, and their essence was absorbed by Asriel, granting him immense power.
After the death of Chara, Asriel’s parents, King Asgore and Queen Toriel, declared war on humanity out of grief and anger. Asriel, however, was reluctant to fight and longed for peace. Eventually, a plan was devised for Asriel to absorb the souls of six human children, which would grant him godlike power and allow him to break the barrier separating the Underground from the surface world.
However, during this plan, a human named Frisk fell into the Underground and formed a friendship with Asriel. In the end, Asriel sacrificed himself to save Frisk and break the barrier. As a result, his physical form disintegrated, and his essence was scattered.
Following his death, Asriel’s essence combined with a golden flower found in the Underground, giving rise to the character known as Flowey. As Flowey, Asriel lost his memories and became a malevolent being, devoid of compassion and driven by a desire for power.
It is during his time as Flowey that Asriel spends the most considerable portion of his life. As a flower, he experiences a sense of endless repetition, continually resetting the timeline and experimenting with different outcomes. Time and age hold little meaning for him in this state.
Eventually, with the help of Frisk, Asriel regains his true form and memories, confronting his past actions as Flowey. In the game’s true ending, Asriel is restored to his original self, albeit briefly, before bidding farewell to Frisk and returning to the Underground.
Given the complex nature of time and existence in the game, it is difficult to assign a specific numerical age to Asriel. While he may physically appear as an 11-year-old boss monster, his experiences and the time spent as a flower add a layer of complexity to his age.
Asriel Dreemurr’s age can be seen as multifaceted. As a boss monster, he is 11 years old, but his true age is much older, considering his time as a flower and the events that transpired in the game Undertale. The concept of age in the context of Asriel’s character is intertwined with his experiences, growth, and the complex nature of time and existence within the game’s universe.