Given the task definition and input, reply with output. In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

When are you considered a senior?, Context: As of 2000[update], children and teenagers (019 years old) make up 15.1% of the population, while adults (2064 years old) make up 65% and seniors (over 64 years old) make up 19.9%.
over 64 years old