What causes Wrinkles on the Chest?
As with the skin anywhere on your body sun exposure is the main culprit for a wrinkly lined chest and if you think how often your chest and neck area are on show from the day you are born it's no wonder age shows up quickly in this area.
Add to this hormone changes that affect the skin, gravity and perhaps the environment you frequent and you have a recipe for crêpey, saggy old looking skin.
And if you are a side sleeper your body's natural weight distribution causes the skin to fold between your boobs. As skin loses resiliency with age, these folds become unsightly wrinkles and permanent creases on your chest.
For some lines and wrinkles go quickly, maybe after a few hours but during this time the skin looks done, the older you get the longer they stay for until one day they are there for good.