As you grow up, your tastes change. However, it can be difficult to make your home decor keep up with your maturing sensibilities. Hard as it may be, there does come a time when you've got to trade your beer bottle collection with something that doesn't turn binge drinking into a fashion statement. Being young at heart is one thing—being immature in style is a completely different issue! Here are 15 home decor mistakes that may be infringing on your adult life.