Age Classes Northern elephant seals can be categorized into multiple classes based on their age and gender. Females mature earlier than males and reach adulthood several years before males do. Pup = less than 1 month Super Weaner = 1 – 12 months Weanling = 1 – 12 months Yearling = 1 – 2 years Juvenile = 2 – 5 years Adult Female = Over 3 years old Sub-adult Male = 5 – 8 years Adult Male = Over 8 years old