Write a program (in python) that asks the user to enter a person's age. The program should display a message indicating whether the person is an infant, a child, a teenager, or an adult. Following arre the guidelines:

If the person is 1 year old or less, he or she is an infant.

If the person is older than 1 year, but younger than 13 years, he or she is a child.

If the person is at least 13 years old, but less than 20 years old, he or she is a teenager.

If the person is at least 20 years old, he or she is an adult.