I remember seeing a (fairly crappy) stand up bit about penises darkening with age. This rang true as I remember my dad's being darker than mine when I was a young lad, when we would .'cross swords'. (wee in unison).
I was discussing this over lunch yesterday and it was a phenomenon no-one else was familiar with.
Mine's a touch darker than it used to be, a light tan but not as much as I would have expected.
What's your take and experience of penis darkening?