The age of your skin is determined by a lot more than a date on the calendar. Lots of things, ranging from lifestyle choices to genetics, play a role in how old your skin appears. Your skin ages in different ways, too -- not everyone will go through the same aging process.
As you get older, your skin produces less collagen. Collagen is what keeps your skin pulled tightly around your body, so having less means that skin loses some of its youthful elasticity. Your skin may even sag, causing wrinkles [source: Prevention].
When people hit their 40s, skin also produces less oil than it previously did. This will cause your skin to be drier than before, so if you used to wash your face twice a day, you may want to switch to only washing at night. Cleansing can dry out skin even more, so use a quick splash of water to wake yourself up in the morning, and save using a cleanser for removing dirt and makeup for the end of the day. Also be sure to use a moisturizer afterwards -- this can help slow the aging process.
Another skin age factor to watch for is your skin's tone. Your may notice as you get older that the pigmentation in your skin isn't as even as it used to be, or that you have small, darker spots on your skin that weren't there before. Sometimes referred to as sun spots, these little dark circles resemble freckles and shouldn't be confused with moles.
Now that you know what to look for in your skin's age, read on to learn how to keep these factors at bay.