na-adjective, noun
in good health; alive and well; going strong
Used to state that someone (often elderly) is still healthy and active, or that something is still functioning well. Often appears in the form 健在である or 健在だ.
祖父は90歳ですが、まだまだ健在です。
My grandfather is 90, but he's still going strong.
古い工場の設備
The old factory equipment is still in working order.