Fitness First generally welcomes individuals of all ages, but the specific age restrictions can vary by location and membership type. Most Fitness First clubs allow individuals aged sixteen and above to join as members. However, those who are under the age of eighteen may require parental consent to sign up. Additionally, Fitness First offers special youth programs and family memberships that cater to younger members. It is important for potential members to check the specific policies and options available at their local Fitness First club, as these may differ across regions. More detailed information regarding age restrictions and membership terms can usually be found on Fitness First's official web page.