When did the claimant in the scenario turn 21?

The correct answer indicates that the claimant turned 21 years old on September 15, 1991. This can be determined by recognizing that if the claimant was born on September 15, 1970, they would have reached the age of 21 exactly on their birthday in 1991.

Turning 21 is significant as it is typically a milestone age acknowledged in many contexts, including legal and financial matters. In this scenario, the date of birth must be roughly estimated by subtracting 21 years from the date the claimant turned 21; 1991 minus 21 years results in a birth year of 1970. This aligns with the claimed date of September 15, 1991.

The other choices represent dates that do not fulfill the requirement of reaching age 21 by September 15, 1991. Various methods can verify that being accurate with the dates provided is crucial in understanding age-related eligibility in scenarios that often arise in legal and financial assessments.