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A 2003 AARP study reported that 34% of women over 39 years old were dating younger men.
These views are rarely uniform even within cultures and are affected by views of consent, marriage, and gender roles, and by perceptions of social and economic differences between age groups.
Marriage between partners of roughly similar age is known as "age homogamy". Relationships with age disparity of all kinds have been observed with both men and women as the older or younger partner.
Dunn concluded that "Not once across all ages and countries ...
did females show a preference for males significantly younger than male preferences for females" and that there was a "consistent cross-cultural preference by women for at least same-age or significantly older men".
Age disparity in sexual relationships and sexual relationships between individuals of a significant difference in age have been documented for most of recorded history and have been regarded with a wide range of attitudes, from normalized acceptance to taboo.
Concepts of these relationships and of the exact definition of a "significant" age disparity have developed over time and vary between societies, and ethical systems.