According to the sources provided, there are age restrictions for the usage of Cosentyx. Cosentyx is a biologic drug used to treat various inflammatory conditions such as psoriasis and psoriatic arthritis. The drug is manufactured by Novartis Pharmaceuticals and was approved by the FDA in 2015 [1].

The drug is approved for use in adults aged 18 years and older for the treatment of moderate to severe plaque psoriasis, active psoriatic arthritis, and active ankylosing spondylitis [1]. However, Cosentyx is not approved for use in children under the age of 18 years old [2].

In 2019, Novartis Pharmaceuticals conducted a clinical trial to evaluate the safety and efficacy of Cosentyx in children and adolescents aged 6 to 18 years old with moderate to severe plaque psoriasis [2]. The trial showed that Cosentyx was effective in treating psoriasis in this age group, but the drug is not yet approved for use in children and adolescents [2,3].

In conclusion, Cosentyx is approved for use in adults aged 18 years and older for the treatment of certain inflammatory conditions. However, the drug is not approved for use in children and adolescents under the age of 18 years old [1,2].

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/COSENTYX
[2] https://www.cosentyx.com/pediatric-psoriasis
[3] https://www.novartis.com/us-en/sites/novartis_us/files/cosentyx.pdf