Answer:
Ambition is most easily achieved as a child, because you are still dreaming big. Whenever a child sees something they want to do, they would most likely have a strong desire to achieve it. An infant's ambition is food, sleep, and happiness. A teenage ambition is most likely to plan for their future, such as getting into their dream college, get a good score on the SAT, or ACT. A young adult ambition might be looking for love, or finding a good job, etc.
Ambition is most difficult to achieve as a senior citizen because your body is not like what was it before. Your body can get tired more often, and your bones are more brittle.