alive and well; in good health — still in existence and doing well despite expectations to the contrary.
祖父は90歳になったが、今も健在だ。
My grandfather turned 90, but he is still in good health.
一時は健康を心配されたが、作家は健在で新刊も出した。
There were worries about his health for a while, but the writer is well and has published a new book.
噂に反して、彼の店は今も健在だ。
Contrary to the rumors, his shop is still going strong.