@shauna im definitely over 18 and definitely don't---also fat distributes in other ways besides cellulite; the difference between white and brown fat, and further, how close fat gets to the dermis, has a lot to do with diet quality, etc.
Then you are one of the rare, lucky few women that do not have cellulite. Most however do, regardless of their quality of diet.
source: http://breakingmuscle.com/womens-fitness/the-dirty-little-secret-of-the-female-athlete-celluliteAreas like women's thighs and buttocks are especially prone to cellulite because that's where we tend to store body fat. Men and the few women who do not develop cellulite have connective tissue that encourages fat to expand laterally and internally but not out into the dermis. So, a man’s thighs might have just as much adipose tissue, but he has what amounts to compression stockings over the top of the fat layer, whereas a woman has a pair of fishnets lying over her first layer of adipose. These structural differences have been confirmed with MRI, sonogram, and wedge biopsies. There is no getting around it - cellulite and the structure of the skin in cellulite-prone areas are simply different and something you cannot control. I bet you’re still wondering why some women - even thin, lean athletic women - tend to have lots of cellulite and their female counterparts do not. Genetics, my friend. If your connective tissue is put together differently than your friend’s, your skin is going to look different. Just like skin color, hair, and height are all genetically determined, so is your predisposition to cellulite.
source: http://www.scientificamerican.com/article/is-cellulite-forever/It's a condition that affects 90 percent of women and 10 percent of men, mostly in industrial nations. As women start approaching menopause, estrogen starts decreasing. From 25 to 35 is when you start seeing the appearance of cellulite. Estrogen has an impact on the blood vessels. When estrogen starts to decrease, you lose receptors in blood vessels and thighs, so you have decreased circulation. With decreased circulation you get less oxygen and nutrition to that area, and with that we see a decrease in collagen production…. [Also, at this time] fat cells start becoming larger, [they] begin protruding through the collagen [and become the bumpy fat known as cellulite]. Women tend to get cellulite around knees, saddlebags and buttocks, because they have three layers of fat in these areas [instead of just one]. Women also have three levels of fat in the stomach and in the triceps areas.
The [structure of] collagen, the main protein of connective tissue, in women has the appearance of a picket fence, whereas in men it looks more liked a cross-linked fence. So you can see the cross-linked structure is much stronger [and will hold fat in better].
Estrogen also makes fat whereas testosterone breaks down fat. So a women's body is basically—and I hate to say it—genetically designed to be a place for cellulite to develop. Men have one layer of fat throughout their entire body and a one-to-one alpha- and beta-receptor ratio.