Knowing how long the interviewer has been with a company gives you great insight into their commitment and loyalty to an organization. Not only could it show their dedication to the job, but it also give insight into their experience and skills in the workplace.
Additionally, discovering why they remain with a company can help you gain a better understanding of its values, working environment, job satisfaction, and more. Asking this question can provide valuable information about the interviewer as well as the potential employer.
How Long Have You Been At The Company And What Makes You Stay?