In 2021, the gap was at its narrowest (six percentage points) for 3- to 15-year-olds, and at its widest (19 percentage points) for the 16- to 24-year-old age group.
Yn 2021, roedd y bwlch ar ei leiaf (chwe phwynt canran) ymysg plant 3 i 15 oed, ac ar ei fwyaf (19 pwynt canran) ymysg y boblogaeth 16 i 24 oed.