You know you're getting old when all the names in your black book have M. D. after them.

Summary

This quote humorously suggests that as one gets older, their contacts in their black book (referring to a physical or digital contact list) consist mostly of medical doctors (represented by the initials M. D.). It implies that with age, individuals tend to rely more on doctors for health-related issues and appointments, rather than social connections or personal interactions. It humorously highlights the contrast between youthful social contacts and the increased importance of healthcare professionals as one grows older.

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