At What Age Can You Start Using Restylane or Botox?

Botox is a drug used for three different groups:
1) Cosmetic - teenagers do not have wrinkles - no value there
2) Medical - Spastic Contractures - Botox has been used in Cerebral Palsy and other paralytic disease to help with the spastic contractues. Possibly for younger individuals
3) Functional - Axillary Sweating, Migraines, etc - would have to decide on a case by case basis.
Restylane:
1) Cosmetic - Wrinkles and insufficient Lips - probably not til they are 18.
2) Functional - Nasal deformity, Acne Scars - maybe in the mid teens

You can start using Restylane and Botox at any age. However, for cosmetic reasons, a reputable injector will only inject patients who understand the risks involved so they can provide informed consent. Patients should also have realistic expectations of their results and be physically healthy, to ensure that the treatment is safe for them.

The majority of patients who use Botox and Restylane are
between 30 and 50 years of age.The FDA
hasn’t approved these materials for patients who are younger than
eighteen. Although I’ve occasionally see
younger patients with pronounced nasolabial folds or thin lips, Botox and
Restylane are rarely indicated in patients younger than thirty years of age.It’s
important to realize that every patient’s situation is unique.For this reason, it’s important to consult a
specialist if you have concerns that may require Botox or Restylane.

Although most of our Botox and dermal filler patients are between 30 and 50, we do have some patients that like to use these products for preventative purposes in their 20's. The products are FDA approved for 18 years and older so there is no legal reason if you are at least 18 that you could not use them. It's more a matter of preference and need. If you and your practitioner think you could benefit, then any time is a good time.

I
have used it in very young children for reconstruction after dog bites or other
trauma so it's more related to the need for it than the age of the
patient.

FDA has approved the use of restylane and botox starting at age 18.  However, they are typically for patients from 30 to 55.  Younger patients frequently request restylane for lip augmentation. Botox is rare for use before 30.

Restylane is commonly used after age 30, and the FDA approval is for use after age 18. Some patients may need it earlier than their thirties, particularly if they have nasolabial folds that are very pronounced, and are genetically predisposed to this. Others may do it in their twenties for volume enhancement of very thin lips. Botox is injected to minimize lines resulting from facial expression, such as the frown lines and crows feet. They typically start showing in the mid to late twenties. The purpose of injecting at this age is to prevent deep lines and creases on the face, which are much more difficult to correct later on.

Different people start getting treatments at different points in time.
FDA labeling of the products is for use in people age 18-64 with caution in anyone who is pregnant, thinking about becoming pregnant or breast feeding. This is because studies to show safety and efficacy were not performed in patients younger than 18, older than 64, or pregnant, breast feeding, or possibly pregnant.
Is is safe in the other age groups? Possibly but there are no studies to say such and, if used, would be an off-label use of the product.