On 19 July 1872, Ailio was born in Loppi, Grand Duchy of Finland, Russian Empire[3] to a school teacher and future Social Democratic member of Finnish parliament.
[10] In 1921, he expressed study facial features, skin color, and hair structure as less important than the skeleton and inner organs in anthropology.
[11] In Fragen der russischen Steinzeit (1922) Ailio responded to Aarne Michaël Tallgren's conceptualization of Russian Bronze Age cultures, being the third Finnish scholar to do so.
Timo Salminen characterized it as bitter and an exercise to prove his knowledge for the archaeology professorship at Helsinki University.
[13] In 1923, Ailio rejected the notion Giant's Churches were former Stone Age man-made structures and instead labeled them as shore formations.