Your singing voice won't miraculously improve as you get older. Your vocal cords and larynx will grow and mature in early adulthood, and this will allow your voice to grow and develop. But it's the practice, technique, and experience that come with age that will really improve your voice. Your singing voice will change during adolescence, early adulthood and may change again in the future.
Age and practice, rather than puberty itself, can improve voice. The more years you've been singing, the more experience you'll have. But as the vocal cords and larynx grow and mature in early adulthood, this allows the voice to expand and develop. This means you'll be able to do more with it.
The reality is that the aging voice changes and those changes won't always have a positive effect on your singing. If you want singing to be your career for life, the idea of losing your singing voice when you grow up can be stressful. So, when does your singing voice fully develop? This will depend on your genre, if you train, the type of music you play and how often you sing. Becoming more familiar with your vocal ability and taking singing lessons will certainly help you sing better.
Because singing does not depend on fine motor skills or the coordination involved in the use of other instruments, the best age to start singing classes varies from student to student. In fact, many professional singing teachers, such as those at 30 Day Singer, believe that there is no age limit to start singing. If the child enjoys music or sings on radio or television programs, this is a good indicator that he is ready to start learning to sing. So where does all this leave you with your singing career? Remember, there is no set age to start singing and you don't need to wait until you're post-pubescent.
Early adulthood is a milestone for the singing voice because the voice box develops fully and the voice that sings can reach its full potential.