We develop wrinkles with age as our skin becomes thinner and weaker.Repetitive skin bunching that occurs with normal facial movement creases the skin. As the skin loses collagen and elastic, these creases become permanent.Common areas that we develop wrinkles are:Horizontal forehead lines: caused by skin bunching when raising your eyebrows. Due to activity of the frontalis muscle.Frown lines (between your eyebrows): results from skin bunching when scowling or squinting. Due to activity of the procerus, corrugator supercilii and depressor supercilii muscles.Crow’s feet: the wrinkles that extend away from the outer corner of your eyes. Seen when smiling and squinting. Due to obicularis oculi muscle activity.