老, a pictographic character of an old person, serves as both a phonetic and a semantic component to form characters. All the characters formed by the phonetic component 老 are pronounced lǎo except 峔.
Characters formed by the phonetic component 老
姥、佬、荖、蛯、珯、粩、咾、铑、栳、恅、狫、鮱 with the same pronunciation lǎo
峔 mǔ
Characters formed by the semantic component 老
Interestingly, characters formed by the semantic component 老 are in the up-down structure.
老+句 → 耈 gǒu, old age;
老+日 → 耆 qí, aged/in one’s sixties;
老+毛 → 耄 mào, very old, senile;
老+至 → 耋 dié, aged/in one’s eighties
耄 and 耋 are usually used together as 耄耋 to mean “aged person above 70”