How is God the Last when eternity is an attribute of the inhabitants of both realms, despite the inequality between them and the Creator in the attribute of pre-existence?

The second part of the question regarding the inequality in eternality between creatures and their Creator is not understandable, because eternality means ancientness, and Allah, glorified be He, is the First with no beginning, as stated in the Prophet's (peace be upon him) supplication: "O Allah, You are the First, so there is nothing before You." And the Prophet (peace be upon him) said: "Allah existed, and there was nothing else besides Him."