Yes, the other people we see are immortal, but the immortal part of them, the soul, is invisible. What we can see, will die.
No wonder Jesus rebuked the Pharisees for claiming to be able to see, when they were really blind. All of us are blind when it comes to the life of the spirit. Only God can give us vision. But even then, we must walk by faith.
St. John of the Cross says the soul walks in darkness, and faith is its light.
It's kind of like putting aside all your worldly concerns, all your
|Star of Bethlehem|
May we, like the Magi, trudge on, continue the long journey, carrying our very best gifts to present Him when at last we reach Him.