Those who identify in the “White” high level ethnic group are generally older than other ethnic groups, which may explain some of the differences seen between ethnic groups.
Mae’r rheini sy’n dweud eu bod yn y grŵp ethnig lefel uchel “Gwyn” yn gyffredinol hŷn na grwpiau ethnig eraill, a gallai hyn esbonio rhai o’r gwahaniaethau a welwyd rhwng grwpiau ethnig.