Exodus 30:14

All who pass over to the numbered, from twenty years old and upwards, shall give the heave-offering of Yahweh.

Numbers 1:3

from twenty years old and upwards, every one able to go forth to war in Israel, - ye shall number them by their hosts, thou and Aaron;

Numbers 1:18

all the assembly also, called they together on the first of the second month, - and they declared their pedigree according to their families by their ancestral houses, - in the counting of names from twenty years old and upwards by their polls.

Numbers 1:20

And they were as followeth - The sons of Reuben, the firstborn of Israel, in their pedigrees - by their families, by their ancestral houses, in the counting of names, by their polls, every male, from twenty years old and upwards, every one able to go forth to war;

Numbers 14:29

In this desert, shall your dead bodies fall And none of you who were numbered in all your counting, from twenty years old and upwards, - who have murmured against me,

Numbers 26:2

Reckon ye up the sum of all the assembly of the sons of Israel from twenty years old and upwards, by their ancestral houses, - every one able to go forth to war in Israel.

Numbers 32:11

Surely none of the men that came up out of Egypt from twenty years old and upwards, shall see the soil, which I sware unto Abraham, unto Isaac and unto Jacob, because they have not followed after me fully;

Treasury of Scripture Knowledge

Summary

Every one that passeth among them that are numbered, from twenty years old and above, shall give an offering unto the LORD.

Bible References

From twenty

Numbers 1:3
from twenty years old and upwards, every one able to go forth to war in Israel, - ye shall number them by their hosts, thou and Aaron;
Numbers 14:29
In this desert, shall your dead bodies fall And none of you who were numbered in all your counting, from twenty years old and upwards, - who have murmured against me,
Numbers 26:2
Reckon ye up the sum of all the assembly of the sons of Israel from twenty years old and upwards, by their ancestral houses, - every one able to go forth to war in Israel.
Numbers 32:11
Surely none of the men that came up out of Egypt from twenty years old and upwards, shall see the soil, which I sware unto Abraham, unto Isaac and unto Jacob, because they have not followed after me fully;