145. A Third-Class Medical Certificate is issued to a 36-year-old pilot on August 10, this year. To exercise the privileges of a Private Pilot Certificate, the medical certificate will be valid until midnight on

Title 14 § 61.23 Medical certificates: Requirement and duration.

(d) Duration of a medical certificate. Use the following table to determine duration for each class of medical certificate:
...
(2) A third-class medical certificate
(i) Under age 40 — 60th month after the month of the date of examination shown on the medical certificate.