Some people are predisposed to developing a double chin, meaning there is a genetic component, and obesity is not the underlying cause. However, obesity may make a double chin more apparent. Another major cause is aging. As we get older, our skin loses its [simple_tooltip text=elasticity tooltip=Stretchiness or the capacity of a substance or object to regain its original shape after being squeezed or stretched. ] and collagen weakens. Some of us develop this more so than others, and it can lead to a double chin.