The USPHS age limit is 44, plus credit for any time served in the military. For example, if you served four years prior, your age limit would be 48.
The Navy Reserve Nurse Corps has a “soft” age limit of 40. From the Navy Reserve website: “Age - You should be at least 18 and no older than 40 years of age at time of appointment. Maximum age limits may be waived on a case-by-case basis, depending on qualifications and the needs of the Navy Reserve.”
http://www.navyreserve.com/opportunities/officer/healthcare_nc.jsp
oops ..... sorry I missed your post ...disregard my erroneous data. That is what happens to an old Chief that has be drydocked for tooo many years