middle-aged band; dad band
A band whose members are mostly middle-aged or older, often amateur. The term carries a casual, sometimes self-deprecating tone.
I have dad band practice on the weekend.
That middle-aged band is pretty good, isn't it?
Katakana spelling is common and matches usual-kana usage.
Kanji spelling exists but is uncommon; the word is usually written in kana.
Compound of オヤジ (oyaji, 'middle-aged man') and バンド (bando, 'band'). The exact origin is uncertain, but it likely emerged in colloquial Japanese to describe amateur bands formed by older men.