Though I can not present any evidence , suspect the chemical radiated from cedar wood slows down the aging process . We all know it puts out something that repels certain insects , thus the cedar chests . I live in a house with untreated and unsealed cedar board walls and ceiling . I have had one doctor after checking me out , tell me prepare to live to be very old . Other medical professionals after running tests have told me they are getting the readings they would expect from a teenager . I am 73 .