As you get older, your body’s internal processes — from skin cell turnover to workout recovery — slow down and take longer to complete or recharge.
This leaves room for signs of aging, such as wrinkles and fatigue, to occur.
These changes may be surprising if they happen earlier than expected, hence the term “premature” aging.
It’s impossible to avoid these changes completely, but there are ways to reduce the signs of aging in your body — especially if they’re happening before you’re ready to embrace them.
There are a couple of different factors that have a direct effect on how quickly these signs appear on your body. (Premature aging)
Smoking
The toxins in cigarette smoke expose your skin to oxidative stress. This causes dryness, wrinkles, and other signs of premature aging.
Aging and Stress
Chronic, high-stress lives are a good recipe for aging. Aside from the effects that a worried face has on facial wrinkles, stress affects everything from the way we carry ourselves to our energy level. People who are consumed with daily stress do not walk tall and proud like people who are feeling good about themselves. They move slower and they challenge their bodies less. People who are overwhelmed with stress also tend to have illnesses that can help the aging process along.
Sun exposure and tanning
Tanning beds and exposure to the sun penetrate your skin with UV rays. These rays damage the DNA in your skin cells, causing wrinkles. 
Genes
There are some very rare genetic conditions that can cause you to show signs of aging in childhood and early puberty. These conditions are called progeria.
Werner syndrome affects 1 in 1 million people. It causes wrinkled skin, graying hair, and balding to develop between 13 and 30 years old.
Hutchinson-Gilford syndrome is an even rarer condition, affecting 1 in 8 million babies.
Children with this syndrome don’t grow as quickly as others in their age group. They also experience thin limbs and baldness. The average life expectancy for children living with Hutchinson-Gilford syndrome is 13 years.
Also read:- How To Get Glowing Skin Naturally At Home
Aging and Weight
Being too thin or too heavy can add to the aging process. Being underweight reduces the natural fats in the facial structure which allows the skin to sag and adds to the appearance of wrinkles. A facelift or Botox doesn’t help an underweight face look younger because the natural fattiness that fills out the face can’t be replaced with medical procedures like these.