What is the technical name for the birth and death dates that follow a person's name?

There has been discussion here as to the proper way to indicate a birth-death range for a person still alive.

I would like to know what the the grammatical name of these dates.

For example, in the following sentence:

Albert Einstein (1879–1955) invented the theory of relativity.

What is the technical name for the string "(1879–1955)" ?

Solution 1:

In the art world, the artwork caption labels known as tombstones have what are formally known as "life dates." You can also find the term "life dates" applied descriptively in genealogy, biographical, encyclopedic, and other archival contexts.

Here's an excerpt from the Association of Art Editors style guide:

Life dates: Give in full. Examples:

       1908–1972
       Arminius (c. 17 B.C.–A.D. 21)
       385–331 B.C. (All digits are given for all B.C. dates.)

Abbreviations may be used in text for life dates given in parentheses. Examples:

       born = b. (b. 1930) Note: this is preferable to the form (1930–)
       died = d. (d. 1538)
       about = c. or ca. (ca. 1489–d. 1538)
       flourished = fl. (fl. 1503–30) (fl. 1530s) (fl. 16th century)
       date known but unverified = ? (1489?–d. 1538)
       active = act. (or spell out) (act. 16th century or active 1711–16)

Rutgers Art Review's editorial style guide calls them, quite literally, "parenthetical life dates":

As an aid to the reader, please provide parenthetical life dates for historical figures, as well as publication dates for works discussed in the main text.

Solution 2:

I don't know if there is a standardized technical term for it, but if I had to talk about the concept or if I had to propose easily understood terms, I'd go with lifetime or life span. After all, the terms work fine in general usage.

Halley's comet was visible to the naked eye just once during Albert Einstein's lifetime, 1879–1955.