Is Heaven eternal just like Allah is eternal?

The last line that he says is a good summary:

“So ultimately, in absolute terms, only Allah is “Akhir” (Last) but human beings can find no Akhir(End).”

In another video, Khalifatul Masih IV, Mirza Tahir Ahmad RH explains that we will live forever in heaven but it does not mean we are eternal just like Allah as the definition of being eternal means something that does not have a beginning AND no end. Since we do have a beginning, we will not be eternal, even if we live forever in Heaven.