It is natural for skin to age, and how it ages can depend on everything from our genes to how we treat our skin. Failure to apply sun cream can damage the sun, leading to wrinkles, age spots, and hyperpigmentation.
If you're a smoker, you're depriving your skin of the oxygen it needs to function correctly and maintain vitality, thus speeding up the ageing process too. Poor diet, constant exposure to pollution, and a failure to care for your skin can all help to speed up the ageing process.