Answer by Tirumalai Kamala:

No, not too late. The CDC and the WHO are the appropriate and relevant resources for public health questions like this.

This is what the CDC recommends for an adult who never got vaccinated against measles:

Page on cdc.gov

Here is the WHO web-site that provides global immunization schedules, searchable by antigen (disease), and age-group.
Immunization schedules by antigens

If an adult has never had measles, or been vaccinated for it, should they get vaccinated, or is it too late?