Children and young people aged 5 to 15 years old were more likely to report that they could speak Welsh (50.7%, 248,100) than any other age group.
Roedd plant a phobl ifanc 5 i 15 oed yn fwy tebygol o adrodd eu bod yn gallu siarad Cymraeg (50.7%, 248,100) nag unrhyw grŵp oedran arall.