KJV : From thirty <07970> years <08141> old <01121> and upward <04605> even until fifty <02572> years <08141> old <01121>, all that enter <0935> (8802) into the host <06635>, to do <06213> (8800) the work <04399> in the tabernacle <0168> of the congregation <04150>.

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NASB : from thirty years and upward, even to fifty years old, all who enter the service to do the work in the tent of meeting.

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NASB# : from thirty<7970> years<8141> and upward<4605>, even to fifty<2572> years<8141> old<1121>, all<3605> who enter<935> the service<6635> to do<6213> the work<4399> in the tent<168> of meeting<4150>.