Man made -- pointing at a rock you own and saying ?? million years is not going to play here. Anyway so I was buying things at a car boot sale (probably not a major surprise to any followers of http://gbatemp.net/threads/things-you-recently-bought-or-got.347639/ ) and chucked a book onto the pile. Turns out it was from the 1830s Considering it was some 30 before origin of species the level of science on display is actually quite impressive, I am not much of a biologist/botanist but it has been pretty good reading thus far. I figured that is then probably the oldest thing I own and now we have this thread.