God said everyone counted from what age up would die in the wilderness?

Answer: Twenty

All who were counted in the census, twenty years or older, would fall in the wilderness, except Caleb and Joshua.

“Your bodies will fall in this wilderness—all who were numbered in the census, everyone twenty years of age or older—because you have grumbled against Me. Surely none of you will enter the land in which I swore to settle you, except Caleb son of Jephunneh and Joshua son of Nun.”— Numbers 14:29-30 (BSB)