The term "member of the Old Guard" often refers to an individual who is part of an established and experienced group, typically in a traditional or conservative profession or organization. Synonyms for this term can include "veteran," "senior member," "longtime member," "established member," "seasoned professional," "experienced practitioner," or "respected elder." Other similar expressions might include "institutional insider," "original member," "founding member," or "core member." These words reflect the significance and value of those who have long-standing experience and expertise within a particular field or community, and are often well-respected and looked up to by others within their group.