One of my prize possesions is an Osage self bow built by an Uncle in 1935. He and several other young men in their home town of Roscoe, TX were invited to the local railroad station to tear down an old fence, and their pay was to be keeping any of the old materials. Well my uncle brought home one old fence post and and carved a beautiful bow out of it. He passed it to me maybe 10 years ago and I carefully displayed it in my home until maybe 3 months ago when one day I get the bright ideal to see if their was any life left in it. So I made up a string and oh so carefully braced it to 6" and then gently exercised the limbs a bit, listening for any creaking/cracking or other indicators I should stop...but they never came and soon I was launching some very quick and satisfying arrows. It draws perhaps 60# and has taken maybe 1" of string follow with weekly shooting. I had the thought that if the fence that supplied this fine piece was old and decrepit enough to justify replacement in the middle of the great depression in a rather poor West Texas town it must have been rather old at the time, maybe 30+ years, suggesting that at least one very old piece of wood is still sound and shootable. I say build away!