 The phrase has also been used to refer more specifically to health and economic implications associated with population aging by major medical publications including "The British Medical Journal", "New England Journal of Medicine", and professional organizations including American Psychological Association.According to Google’s Ngram Viewer, variants of the Silver Tsunami metaphor (for example, "age wave, grey hoard, rising tide, grey" or "gray tsunami") first occurred in reference to population aging in the 1980s.Scholars from a range of disciplines including humanities, health professions, and social science have argued that the "silver tsunami" does not constitute neutral language to describe population aging, calling it "dangerous" and "a nasty metaphor for older adults".