How many grandmasters are alive?

Could you please elaborate on the context of the question "How many grandmasters are alive?" Are we referring to chess grandmasters, martial arts grandmasters, or perhaps a different field altogether? Without a specific domain in mind, it's difficult to provide an accurate estimate as the number of grandmasters alive varies greatly depending on the discipline and the criteria used to designate someone as a grandmaster. Could you please clarify the field or area of expertise we're discussing?