This is 4th channge of Code Academy JS Challanges. Write a function, lifePhase(), that takes in a person’s age, as a number, and returns which phase of life they are in.
Here are the classifications: 0-3 should return 'baby' 4-12 should return 'child' 13-19 should return 'teen' 20-64 should return 'adult' 65-140 should return 'senior citizen' If the number is less than 0 or greater than 140, the program should return 'This is not a valid age'