noun
silver volunteer
A volunteer who is a senior citizen, typically retired, engaging in community service or social activities. The term is a Japanese wasei-eigo compound.
地域の清掃活動にシルバーボランティアが参加した。
Silver volunteers participated in the local cleanup activity.
シルバーボランティアとして、週に一度
As a silver volunteer, I read books to children at the library once a week.