Again,this is a hypothetical situation.The bible supports life in Gods image with spirits and man.Animals arent created in Gods image.They will die.Man had the prospect of living forever until A&E sinned and of course a seed <Jesus>ransomed his life to break the works of the devil up.
Its too complicated to explain RE 1914 when in 606 BCE Gods temple was destroyed.You can get the explanation on JW.org if u are interested.Its EZ to understand tho what he explained to the disciples in signs when they asked him.Total war,famine,earthquakes,lawlessness,Math 24:14 kingdom being preached worldwide etc.Jesus said the generation that first saw these signs WOULD NOT pass away.They would see the end.The generation you spoke of is long gone and armagheddon hasnt happened.JWs knew in late 1800s 1914 was going to be a significant date.ww 1 starting showed Satan and his angels were thrown out of heaven and confined to earth and a WOE would begin as Revelation states.Again i suggest you put 1914 in box on JW.org and see how they knew 1914 was when Jesus would begin ruling in heaven and eventually after Satan and his angels are abyssed and the wicked on earth are gone the 1000 yr rein of Jesus would begin here to bring man back to perfection and many would be resurrected to learn truth.There will be a resurrection of the righteous and the unrighteous to hear the truth and decide who righful ruler is and love and obey the TRUE God.Satan and angels are let loose after 1000 yr rein of Jesus and they still bring down many.The bible said its likened to the sands of the sea...many.Then the wicked will be put out along with Satan and his angels forever.The earth turned into a paradise,man brought back to perfection.The scripture,1 John 2:17 New King James Version (NKJV)
17 And the world is passing away, and the lust of it; but he who does the will of God abides forever.
Also Read Jude 1:5 RE rebellious angels.Also remember in Genesis the scripture "the sons of God noticed the good-looking woman."This isnt referring to man.And again you dont seem to know how Abraham entertained angels,or that angel Gabriel took on a fleshly body to announce Jesus birth to the shepards.Other instances in bible RE angels appearing to man in bible as well.
Something else i need to address you asked.In that time pre-flood angels were permitted to put on fleshly bodies.Remember Freedom of choice?And in book of Job God asks Satan in heaven where were you?Satan told him roving about in earth.Satan and his angels were NOT thrown out of heaven yet.They were in 1914 as Rev explains war in heaven.I told in late 1800s,1914 was chosen when that war would break out and Jesus started ruling.Be glad u heavens and woe to the earth cos the devil is angry and his time is short.All in Revelation.Not hard to see from 1914 till present the conditions on earth.