Photoaging refers to the aging effects of the sun, it causes wrinkles, sagging and thickening of the skin, a dermatologist dream in a consultation.
I leave you here with an image published in the New England Journal of Medicine by Jennifer Gordon and Joaquin Brieva.
This is a trucker that received sun exposure on only one side of his face, so if you want to know what you face would look like without sun exposure....here it is.
Keep in mind that this exposure was though a window, so this means that the photoaging effects of the sun can be caused even behind glass, as the authors state in the article "Although exposure to ultraviolet B (UVB) rays is linked to a higher rate of photocarcinogenesis, UVA has also been shown to induce substantial DNA mutations and direct toxicity, leading to the formation of skin cancer"
If you want to see the original, follow this link