Whilst 85% of people aged 16 to 64 competed the interview for themselves, only 57% of people aged 65 or over did so.
Cwblhaodd 85 y cant o bobl 16-64 oed y cyfweliad drostynt eu hunain, ond dim ond 57 y cant o bobl 65 oed a throsodd wnaeth hynny.