Not sure about Will, but if Lyra is to be believed she is eleven, as she says when questioned at Bolvangar.
Phillip Pullman wrote 'His Dark Materials.'
Light, particularly ultraviolet light, causes chemical changes in organic materials. This leads to decomposition. Old documents are kept in the dark to preserve them.
The name of Lyra's father in "His Dark Materials" is Lord Asriel Belacqua.
Dark corn sugar or dark brown sugar.
Philip Pullman
the gagostiles
a torch
Phosphorescent materials.
The second book in Philip Pullman's "His Dark Materials" trilogy is titled "The Subtle Knife."
The duration of The Old Dark House is 1.18 hours.
Dark materials will get hotter in the sun, but smooth shiny metal will get hotter faster when exposed to direct heat like fire. Be more specific with your question.
old materials and improved materials