Normal Development: 15 to 17 Years Old

Each child is unique. While some behavior and growth milestones tend to happen at certain ages, a wide range for each age is normal. It is okay if your teen reaches some milestones earlier and others later than the average. If you have any concerns about your teen’s development, check with your healthcare provider. Here’s what you might see your teen doing between 15 and 17 years of age.


  • May stress over school and test scores.
  • May have high expectations and low self-image.
  • Seeks privacy and time alone.
  • Worries that they are not physically or sexually attractive.
  • May complain that parents try to keep them from doing things independently.
  • Start to want both physical and emotional closeness in relationships.


  • Seeks friends who share the same beliefs, values, and interests. Friends become more important.
  • Explores romantic and sexual behaviors with others.
  • May be influenced by peers to take risks with alcohol, tobacco, sex, or other things.


  • Is better able to set goals and think in terms of the future.
  • Has a better understanding of complex problems and issues.
  • Starts to develop moral ideals and to select role models.


  • Most girls complete the physical changes related to puberty by age 15.
  • Boys continue to mature and gain strength, muscle mass, and height. Testicles get bigger, the voice changes, and pubic hair starts to grow.
Written by Robert Brayden, MD, Professor of Pediatrics, University of Colorado.
Pediatric Advisor 2015.1 published by RelayHealth.
Last modified: 2012-09-25
Last reviewed: 2013-09-18
This content is reviewed periodically and is subject to change as new health information becomes available. The information is intended to inform and educate and is not a replacement for medical evaluation, advice, diagnosis or treatment by a healthcare professional.
Copyright ©1986-2015 McKesson Corporation and/or one of its subsidiaries. All rights reserved.

Patient Portal

myTuftsMed is our new online patient portal that provides you with access to your medical information in one place. MyTuftsMed can be accessed online or from your mobile device providing a convenient way to manage your health care needs from wherever you are.

With myTuftsMed, you can:

  1. View your health information including your medications, test results, scheduled appointments, medical bills even if you have multiple doctors in different locations.
  2. Make appointments at your convenience, complete pre-visit forms and medical questionnaires and find care or an emergency room.
  3. Connect with a doctor no matter where you are.
  4. Keep track of your children’s and family members’ medical care, view upcoming appointments, book visits and review test results.
  5. Check in on family members who need extra help, all from your private account.


Your privacy is important to us. Learn more about ourwebsite privacy policy. X