“I never imagined that retirement would keep me so busy - but when you're doing something you care about, it doesn't really feel like work.
“Doeddwn i erioed wedi dychmygu y byddai ymddeoliad yn fy nghadw mor brysur - ond pan fyddwch chi'n gwneud rhywbeth rydych chi'n poeni amdano, nid yw'n teimlo fel gwaith.