Set a person's birthdate from their age on a date

The person object is capable of storing birthdate information in 2 fields:

• birthDate (Date)
• birthDateEstimated (Boolean)

The API should support setting the person's birthdate from an age directly by using these fields. This should support the current standard of representing estimated birth dates as "January 1" on the appropriate year.

I propose adding a method on the Person object:

public void setBirthdateFromAge(int age, Date ageOnDate);