The best age to become a pilot depends on various factors, including personal goals, physical health, and career ambitions. However, here are some general guidelines:

1. Minimum Age Requirements:
   
   

   • Private Pilot License (PPL): The minimum age is typically 17 years old.

   • Commercial Pilot License (CPL): The minimum age is usually 18 years old.

   • Airline Transport Pilot License (ATPL): You can start training at 21 years old to become an airline captain, though you can accumulate hours beforehand.

2. Ideal Age:
   
   

   • Many people start their pilot training in their early to mid-20s. This age is considered ideal for building the necessary flying hours while being physically fit and mentally sharp.

   • If your goal is to become a commercial or airline pilot, starting earlier gives you more time to gain experience, and you can often begin flying professionally by your late 20s or early 30s.

3. Late Start:
   
   

   • It's still possible to start flying later in life, even in your 40s or 50s, although you may face challenges in terms of physical health requirements and the time needed to accumulate flight hours. Many people start second careers as pilots and still find success.

4. Retirement Age:
   
   

   • In many countries, airline pilots are required to retire by the age of 65. However, some commercial pilots continue flying as instructors or in other capacities beyond this age.

In short, the best age for becoming a pilot largely depends on your goals and circumstances, but starting in your 20s allows you to pursue a long and fulfilling career.