The "4 Ages of Man" Folio

[bi3mw]

..... Upon checking the BL manuscript I'm a bit confused since this is a marginal scene. It almost looks as if the figure's pose was used as an example, like a model but perhaps with a different meaning. .....

Not directly related to this marginal illustration, but at least they are mentioned:

Hutcheson, G. S. & Blackmore, J. (Eds.), Queer Iberia, Duke University Press, 1999, p. 137

.... There is also ample documentation from the fourteenth and fifteenth centuries of, for example, the use of the digitus virilis (cf. Ger. elfte/steife Finger 'the eleventh/stiff finger') with this meaning in carnivalesque genres (Aigremont 328; Catholy 247). Compare the visual pun in The Rutland Psalter (c. 1260), apparently the manuscript illustrator's suggestion as to what the learned Latin scribe can do with his pen .....

The reference to the Hebrew calendar is definitely interesting and deserves a closer look.