Assuming he's still alive, how old would he be now?

　　假定他還活著，現在有多大年紀了？

　　I was glad to hear you're alive and well.

　　聽說你健在我很高興。

　　She's alive ─ her heart is still beating.

　　她沒死——她的心臟還在跳動。

　　There is little hope that they will be found alive.

　　活著找到他們的希望很渺茫。

　　We don't know whether he's alive or dead.

　　我們不知道他是死是活。