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 canran uwch o blant a phobl ifanc 11 i 15 oed yn gallu darllen ac ysgrifennu Cymraeg yn dda neu’n dda iawn na’r rhai 3 i 7 oed, gan ddangos cynnydd wrth iddynt fynd drwy’r system addysg.