As a general rule of thumb, here is what you should know to care for skin at any age: 
30s: In your 30s, your skin loses its ability to retain water as it once did. Its renewal powers also slow down and it starts producing less collagen and elastin. Due to these factors, fine lines can start to develop, skin tone can turn dull and skin can begin to obtain a rough texture. Another common problem for this age group is increased skin sensitivity or conditions like rosacea.
40s: When we are in our 40’s, the aging process becomes more evident. You are more likely to have wrinkles and deep-set lines caused by exposure to the sun, pollution and stress. Skin also loses some of its elasticity. You may experience dry, chapped skin and discoloration. Try to avoid sun exposure and use other products to minimize the effects of aging before they become too difficult to get rid of!
50s: As you enter your 50’s, your skin has also gone through five decades of wear and tear and will show clear signs of aging, such as wrinkles, fine lines, age spots and more. It’s time to acknowledge that you can’t get back the flawless skin of the past, but you can take steps to reduce the appearance of wrinkles and lines. To keep your skin looking luminous, try updating your skin care routine, invest in effective anti-aging products and make sure you moisturize.
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Skin Care by Donna: An Organic Skin Spa 