As much as I want to believe in an age of accountability, I have never found any hint of it in scripture.
On the subject of ages in heaven, I've always thought of souls as being ageless. We are hindered by age in our human bodies, but apart from that, our souls are eternal.
I hate to sound argumentative, but we are souls. A soul is a living creature that breathes for a living...
Gen 2:7 And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living
soul.
soul:
H5315
נפשׁ
nephesh
neh'-fesh
From H5314; properly a breathing creature, that is, animal or (abstractly) vitality; used very widely in a literal, accommodated or figurative sense (bodily or mental): - any, appetite, beast, body, breath, creature, X dead (-ly), desire, X [dis-] contented, X fish, ghost, + greedy, he, heart (-y), (hath, X jeopardy of) life (X in jeopardy), lust, man, me, mind, mortality, one, own, person, pleasure, (her-, him-, my-, thy-) self, them (your) -selves, + slay, soul, + tablet, they, thing, (X she) will, X would have it.
Here are some more souls...
Gen 1:20 And God said, Let the waters bring forth abundantly the moving creature that hath
life, and fowl that may fly above the earth in the open firmament of heaven.
The word for life there is nephesh, same as the soul man is.
Gen 1:21 And God created great whales, and every living
creature that moveth, which the waters brought forth abundantly, after their kind, and every winged fowl after his kind: and God saw that it was good.
The word for creature is nephesh. Crabs, Lobsters, clams and sea snails are souls.
Gen 1:30 And to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is
life, I have given every green herb for meat: and it was so.
Yep, nephesh; souls. Skunks, lizards, salamanders and toads are souls.
Gen 2:19 And out of the ground the LORD God formed every beast of the field, and every fowl of the air; and brought them unto Adam to see what he would call them: and whatsoever Adam called every living
creature, that was the name thereof.
Same word, they are all souls.
Can a soul die?
Eze 18:4 Behold, all souls are mine; as the soul of the father, so also the soul of the son is mine: the soul that sinneth, it shall die.
Eze 18:20 The soul that sinneth, it shall die. The son shall not bear the iniquity of the father, neither shall the father bear the iniquity of the son: the righteousness of the righteous shall be upon him, and the wickedness of the wicked shall be upon him.
Mat 10:28 And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.
Souls can and do die. The essence of salvation is to be given life, not just the electro-chemical existence, but life...
Rom 6:23 For the wages of sin is death;
but the gift of God is eternal life through Jesus Christ our Lord.
Without the gift of God (eternal life through the Holy Spirit) we would simply die and cease to exist for ever and ever.