白髪しらが交まじり

し

ら

が

ま

じ

り

Meanings

1

noun which may take the genitive case particle 'no'

grizzled; streaked with grey

Describes hair that is mixed with white or grey, typically due to aging. Used as a no-adjective modifying nouns like 髪 (hair) or 頭 (head).

He had his grizzled hair cut short.

白髪しらが交まじりの男だん性せいが公こう園えんを散さん歩ぽしていた。

A man with greying hair was taking a walk in the park.

白髪しらが
白髪 refers to white/grey hair itself, while 白髪交じり describes hair that is mixed with white/grey.
ごま塩しお頭あたま
ごま塩頭 is a more colloquial and vivid expression for salt-and-pepper hair, while 白髪交じり is a neutral, descriptive term.

白髪しらが交まじり
Standard kanji spelling using 交じり (mixing).
白髪しらが混まじり
Variant using 混じり (mixing/blending), also common.
白髪しらがまじり
Kana spelling of the suffix, often used when the kanji choice is not important.

Compound of 白髪 (しらが, white/grey hair) and 交じり (まじり, mixing), from the verb 交じる (まじる, to be mixed).