健在(けんざい)in good health, well, going strong

父(ちち)は八(はち)十(じゅっ)歳(さい)ですが、まだ健在(けんざい)です。

My father is eighty years old, but he is still in good health.

健在(けんざい)だった祖母(そぼ)が急(きゅう)に亡(な)くなってしまった。

My grandmother, who had been in good health, suddenly passed away.

ベテラン上司(じょうし)の実力(じつりょく)が健在(けんざい)だったので安心(あんしん)した。

I was relieved to see that my veteran supervisor's skills were alive and well.

両親(りょうしん)はまだ健在(けんざい)なので、今年(ことし)中(じゅう)にこの世(よ)を去(さ)ったりするまい。

Since my parents are still in good health, they won't be leaving this world this year.

健在(けんざい)だった人(ひと)が事故(じこ)や事件(じけん)に巻(ま)き込(こ)まれたりして急逝(きゅうせい)する事(こと)は起(お)こり得(う)る。

It is possible for a person who was alive and well to suddenly pass away due to accidents or incidents.