I am wondering if there exists a specific symbol or word I can use in a birth-death range. When I introduce a specific person in my main text, I use a footnote to provide the reader some additional information. I use the following syntax
Fullname, Birth--Death, Nationality Profession
Here is a example of a person who already died:
Peter Adam Baruch David Goldberg, 1923--1997, American actor
Now I want to introduce a person that has not yet deceased
Anna Maria von Hausdorff, 1988--???, Polish singer
Does there exist a symbol or an abbreviation to replace the ??? in this notion? Or can someone provide me with a best-practice method?