Data in Australia  and United Kingdom  show an almost identical pattern. In English-speaking countries, where financial disparity, and an implicit money-for-companionship exchange, is perceived as central to the relationship, the elder of the two partners perceived as the richer is often called a "sugar daddy" or "sugar mama" depending on gender.
Bureau of the Census, U. Most men marry women younger than they are; with the difference being between two and three years in Spain,  the UK reporting the difference to be on average about three years, and the US, two and a half. In females, relative youth and physical attractiveness which males valued more compared to females demonstrated cues for fertility and high reproductive capacity. Variations among Developing Countries". In the latter case, the term trophy is broadened to include any substantial difference in power originating from physical looks, wealth, or status.