"Last updated..." on a CV?

I almost always include a last updated date on my CVs. There are numerous online copies of my CV that I am no longer in control of and I think it is useful that people can see that what they are looking at is 10-20 years out of date.

It's not uncommon for academics to not update their CV for years. That is, only update it when required for a job application or promotion. Thus a "last updated" date provides a useful warning that this CV might not have recent publications and activities on it.

There may also be multiple versions of a person's CV floating around. The date will help you quickly determine which should be used.