It's that simple

The person Rean found was an old man who was in the Core and Soul Fusion Realm. It didn't matter how one looked at him. He wasn't anything impressive at all. From his appearance, he had definitely spent most of his life already, and that's already considering a Core and Soul Fusion Realm cultivator could live for 300 years.

The guy also didn't seem to have a house or anything like that. His clothes were ragged, and from what Rean could see with his Divine Sense, the streets were his house. He kept begging for money and food, together with a few other cultivators from other humanoid races. It's just that, by far, he was in a worse situation.

That's because this was the Realm of Gods. Reaching the Nascent Soul Realm was supposed to be quite easy as long as one didn't die. The other beggars around him were much younger and were mostly at the Nascent Soul Realm.