attain one's majority
attain the age of majority

The lack of records suggests he had not attained his majority.

Soon after attaining his majority, ill health caused him to make a trip to the far west.

On 17 October 1659, however, the young count died shortly before attaining his majority.

He then studied law, and, upon attaining his majority, was admitted to the bar in 1805.

"I must undergo a rite of passage in order to attain my majority and become King," he said.

In 1609 John Christian attained his majority and assumed the government.

Universal history was born in cities, and attained its majority with the town's decisive victory over the country.

He will not attain his majority for some years.

Upon attaining his majority he found an ample fortune awaiting him.

In three months he would attain his majority and come into possession of his small fortune.