I asked New York City plastic surgeon and founder of the Youth Corridor Clinic Gerald Imber, MD, if he'd administer a neurotoxin to a young woman with absolutely no wrinkles, and he suggested thinking about genetics. "Often, I take family history into account," he says. "If one's mother and grandmother have no wrinkles, I take a wait and see attitude. Otherwise, small amounts twice a year are a good idea."

Los Angeles dermatologist and founder of SKINxFIVE Ava Shamban, MD, explains how the aging process is different for everyone: "Some people who are 30 look 20, and others who are 30 look 40," she says. "This decade difference in physiological age versus chronological age holds true across the board." And if you're starting to look older than your years due to genetics -- even if you're only 25 -- injections can change the way you age.

Even if you don't have expression lines (yet), early wrinkles can manifest themselves as "resting bitch face" -- which can be treated with injections. "RBF occurs when a person frowns, and the observer is unclear whether the person is thinking hard or concentrating or just plain angry," says Shamban. "In this case, I am treating the frown lines and occasionally the lateral, corners of the mouth to prevent that drooping, angry expression." With a treatment like this, you won't freeze away all emotion, but you will prevent those expression lines -- and you'll look a lot less bitchy, too.

You may look young, but if there's a line starting to form -- even if you wouldn't call it a wrinkle -- preventative injections will stop it in its tracks. "A lot of young people have what I call the uni-line in the forehead -- the line that crosses all the way over," says New York City dermatologist Ellen Marmur, MD, of Marmur Medical. "And they can benefit from baby Botox or baby Dysport." She uses just a small amount of the toxin to smooth a line even before it turns into a wrinkle.

All the doctors I talked to agree that being proactive in your 20s and 30s makes things easier -- and could even save you money -- later. If you take a preventative approach, you'll need less product, less often as you get older, says Imber.

If you have a lopsided feature that bothers you, it can probably be tweaked with filler. Fillers can be used to add angles to the face or balance out an asymmetrical face, says Imber. He uses fillers (or fat transfer) to enhance the angularity of the face and make someone look younger.

"Every individual with asymmetry requires treatment that is tailored to their particular needs," explains Shamban. "So, if they have one side of their forehead that is hypermobile lifting of the brow, Botox can be used to relax the brow. If they are asymmetrical with one cheek larger than the other, or one side of the lip larger than the other, then this can most commonly be corrected by injection of a hyaluronic acid [filler]."

You wear multiple layers of sunscreen. You can't go a day without your favorite antioxidant serum. Retinol is your BFF. Injectables might just be a logical addition to your anti-aging regimen -- even if you don't have wrinkles.

"It's about preserving what you have," says Marmur. "Wouldn't you be happy to stay like this for 30 years?" And when it comes to preventative injectables, sometimes the results look like nothing at all. "Every person who comes to my office wants to look natural," says Marmur. "And I tell everyone, my job is to underwhelm you."