Subjective age has been linked to health outcomes, including functional decline and increased mortality risk. However, its utility in primary care settings remains underexplored.This study aimed to evaluate whether the question "How old do you feel?" could enhance physician-patient communication.In this observational study, thirteen primary care physicians (PCPs) asked 194 patients aged 50 and older the question "How old do you feel?" during clinical encounters. Following each encounter, PCPs completed a questionnaire to assess the impact of the question on the consultation. Data were analyzed using descriptive statistics, and univariate analysis was performed with a mixed-effects logistic regression model to identify factors influencing physicians' perceptions of the question’s utility. We also evaluated their free-text responses to understand their perceptions of this question.PCPs reported positive experiences, with 74% of consultations leading to further discussions, and 80% of PCPs felt the question improved their understanding of the patient. Sixty-two percent believed the question benefited the patient. Factors such as physician age, experience, and patient multimorbidity were significantly associated with positive perceptions of the question’s utility.This study suggests that asking "How old do you feel?" can enhance communication between PCPs and patients, providing valuable insights into patients' overall well-being. This question may help identify vulnerable patients and improve care.Future studies should explore its broader applicability and long-term effects in diverse primary care settings to assess its potential as a standard tool in clinical practice.