en_tn_lite_do_not_use/num/04/30.md

thirty years old ... fifty years old

"30 years old ... 50 years old" (See: rc://en/ta/man/translate/translate-numbers)

join the company and serve in the tent of meeting

The word "company" refers to the rest of the people working in the tent of meeting. See how you translated this phrase in Numbers 4:3.