Explanation:

Recently, the All India Tennis Association (AITA) made it compulsory for all junior players competing at the nationals to undergo an age-verification test. Up until the age of 17 for boys and 15 for girls, science can provide a rough estimate about the true age of a child, give or take a year. The most popular age-verification test is called the Tanner-Whitehouse 3 (TW3), being used by the BCCI and proposed by AITA. TW3 essentially involves an x-ray of the left wrist to check what stage of bone fusion a child has reached. By the time a boy is 17 and girl 15, on average, the bones would have fused completely. But before that age, this test can give an approximate age. What makes this test popular is that it is cheaper and quick to conduct. This test becomes redundant after the age of 17 for boys and 15 for girls, because a child at that age is considered to have a matured body with complete bone fusion. Hence both statements are correct.