#28/29 is the youngest option because that is Chilchuck's age as a half-foot and it is unlikely he'd be younger as a tall-man

[miscellaneousrenaissant]

Below are some compilations of Shuro/Toshiro (26), Laios' and Falin's dad (~30*), and Marcille's dad (~late 40s to late 50s**):

Please compare them to tall-man!Chilchuck:

(My rationale for Touden's and Donato's ages is under the cut, along with some miscellaneous info)

*In Chapter 42, Laios mentions he hasn't seen his parents in over a decade. From the Adventurer's Bible, Falin estimates her parents were about 30 years old a decade ago. Touden's appearances were in either flashbacks of Laios' and Falin's childhoods or from Laios' nightmare, which was relying on his memories. Touden's current appearance in his 40s has not been shown.

**Assuming Marcille didn't enroll in magic school until after her father died at age 82, the youngest he could have been when she was born was 47. He looks similar in memories from when Marcille was a baby and a small child, so late 40s to late 50s seems a safe estimate for his age as he appears in Chapters 79-81.

Miscellaneous Notes:

Chilchuck is canonically underweight.

Shuro's pics were from Chapters 33, 36, and 38 when he wasn't eating or resting properly.

Touden's pics were from Chapters 26 and 42 and the latest edition of the Adventurer's Bible. There is a change in art style between Ch 26 and Ch 42, but he is estimated 30yo in both appearances.

Donato's pics were from Chapters 79, 80, and 81. Technically most of the pics are of a Doppelganger, but it based its appearance on Marcille's memories, and it looks similar to Donato from the flashbacks to Marcille's early childhood.