Tiny wrinkles on the back of David Bushnell's hand, which appear when the skin is put into tension along the wrinkles

David Bushnell is 81. At that age one’s skin is very thin because there is almost no fat beneath the skin. The skin is put into tension in the direction toward the thumb of the opposite hand (upper center), which is pressed into the flesh between thumb and index finger of the hand with the wrinkles.

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