To calculate someone's age on March 2016 if they were born on November 20, 2007, follow these steps:

1. Start with the year difference:

   • From November 20, 2007, to November 20, 2015, they would have turned 8 years old.

2. Check if they had already had their birthday by March 2016:

   • Since March 2016 is before November 2016, they had not yet turned 9.

Thus, they were 8 years old in March 2016.

Would you like more details on age calculations, or do you have any other questions? Here are some related questions:

1. How do I calculate someone's age from their birthdate to today?
2. What’s the age difference between two people born in different months but the same year?
3. How do leap years affect age calculations?
4. What’s the easiest way to find out someone's age for any given date?
5. How do I account for time zones when calculating age?

Tip: When calculating someone's age, always remember to subtract the birth year from the current year, and then check if the person has had their birthday yet that year to finalize the age.