That doesn't mean they are going to die again. Every soul will get the resurrection. Where they go, I don't know. The Lord has spoken of it as outer darkness. So the Lord prepares places for all.
Eternal deaths means that they are separately and singly forever.
They have no increase. The Lord calls that death. Now, if our young people choose that sort of life, if that's what they want, I leave it for them. My father on many occasions gathered his children together and instructed them. Some of our parents don't seem to care.