is outdated
彼らの考え方は時代遅れだ。
Their way of thinking is outdated.
率直に言うと、君の考え方は時代遅れだ。
To be frank, your way of thinking is outdated.
彼の髪型は時代遅れだ。
His hairstyle is outdated.
彼の方法は時代遅れだ。
His method is outdated.