expression
having thin hair; thinning hair
Describes a person whose hair is naturally thin or has become sparse. Often used euphemistically. Compare with 髪の薄い, which is a noun-modifying form.
See also: 髪の薄い
父は若い頃から髪が薄い。
My father has had thin hair since he was young.
最近、髪が薄くなってきた気がする。
Lately I feel like my hair has been thinning.