On average younger people have lower scores: those aged 25 to 44 have a score of 47, compared with a score of 52 for those aged over 75.
Ar gyfartaledd, mae gan bobl iau sgoriau is: mae gan bobl rhwng 25 a 44 oed sgôr o 47, o'i gymharu â sgôr o 52 ar gyfer pobl dros 75 oed.