Inconsistency in Hawking's book?

Question

IT education

Here are quotes from The Briefest History of Time by Stephen Hawking.
We are talking about the general theory of relativity.

Our biological clock also responds to changes in the passage of time. If one of the
twins lives on a mountain top and the other lives by the sea, the first will age faster than the second. And
if they happen to meet again, one of them will be older.

Based on this quote, time flows more slowly near the earth, and faster on the top of a mountain. I can't understand one thing... Does this mean that a person on earth should age faster or vice versa? I can not see the meaning in the phrase "time flows more slowly."
But here we already see another proposal ...

one of the twins
will go on a long journey in a spaceship that accelerates to
near the speed of light. When the wanderer returns, he will be much younger than his brother, who remained on
Earth.

It would seem that now, the one who is near the earth is aging faster. Some kind of inconsistency in my opinion. Whether I can not figure it out to the end ...
Could you explain it to me in simple terms?

Answer 1

Based on this quote, time flows more slowly near the earth, and faster on the top of a mountain.

No.
Rather, either a crooked translation, or an unsuccessful analogy.
If one twin is launched at about the speed of light, and when it returns to Earth, it may not catch the civilization that sent it into space