Angelica also saw teenagers in Hell. I know people have different opinions on this subject; I believe the age of accountability starts at twenty from the scriptures listed.
Number 14:29 The carcasses of you who have complained against Me shall fall in this wilderness, all of you who were numbered, according to your entire number, from twenty years old and above. Num. 14:31 But your little ones, whom you said would be victims, I will bring in, and they shall know the land which you have despised.
Number 32:11 Surely none of the men who came up from Egypt, from twenty years old and above, shall see the land of which I swore to Abraham, Isaac, and Jacob because they have not wholly followed Me. Num. 32:12 except Caleb the son of Jephunneh and Kenizzite, and Joshua the son of Nun, for they have wholly followed the Lord. Num. 32:13 So the Lord's anger was aroused against Israel, and He made them wander in the wilderness forty years, until all the generation that had done evil in the sight of the Lord was gone.
I read where it is Jewish custom that a child becomes an adult at the age of thirteen, therefore thirteen is the age of accountability. The Lord could have set the age at thirteen years old and above but he didn't. He called children nineteen and younger, little ones.
These scriptures show me the Lord didn't hold children under twenty accountable for rebelling in the desert and most teenagers rebel. After raising teenagers I believe they were probably doing most of the complaining.