When she was 12 years of age, Mary Grace Henry was concerned about the lack of education impoverished African girls received.  She taught herself to sew and started making and selling hair accessories, using 100% of the profits to send African girls to school. In 2014 she won the World of Children Award which is like the Nobel Peace prize for children. Now aged 18, her organisation, Reverse the Course, which sold reversible headbands and aimed to reverse the course of one girl's life, has now funded the education of 101 girls in 4 different countries.

After seeing a boy bullied at school Valerie Weisler went up to him and told him he mattered.  She then went home, learnt to make a website and created the non-profit Validation Project.  This organisation teams up troubled teens with mentors who can help them hone a skill such as photography or cooking.  She has also written a Kindness Curriculum which is used in hundreds of schools. And did I mention she's just 17 years old?  You can find out more about Valerie and the Validation Project here.

Another Olympic Swim Team member who is still in their teens is 19 year old Georgia Bohl.  She will be competing in the 100m breaststroke and 100m medley relay.  Her results at last year's national championships were disappointing but rather than being discouraged by them she worked harder and qualified for the Olympics.  Her motto is winning isn't easy.  You can find out more about her here.

At age 16, Aislin Jones is Australia's youngest shooting athlete to compete in an Olympic Games.  She won the Australian National Skeet Championship in January, making her the youngest woman to win the event - she was 15 at the time. She started shooting with her Dad when she was 10. Her motto is dream big. You can read more about her here.

15 year old Lillian Pravda was born with a cataract on her eye which required surgery when she was just nine weeks old.  She had more surgery when she was five years old.  At age 8 she started her own charity called Vision For and From Children which has treated 25,000 kids around the world.  You can find out more about Lillian and her charity here.

Izzi Dymalovski created her own range of skincare for teens and tweens when her Mum wouldn't let her use her products because of the chemicals they contained and told her to make her own.  She appeared on the television show, Shark Tank to pitch her product and did some work experience with Janine Allis who founded Boost.  Her products are now stocked in over 370 Priceline stores around the country. And the craziest part is, she is only 14 years old. Find out more at www.luvurskin.com.au.

Tamsin Cook won the 400m freestyle world junior title last year and she is heading to Rio to represent Australia at the Olympics next month.  At 17 years of age she is the youngest member of the Australian swim team.  It's no secret that to succeed in any sport at that level you not only need talent but a lot of hard work.  Her motto is be the change you want to see in the world. You can find out more about her here.

Justice King is the 2016 Queensland finalist for Young Australian of the Year.  At just 17 she has been busy promoting suicide awareness, contributing to the RUOK Campaign and driving the Suckers for Suicide campaign for three years selling lollipops to raise funds for youth organisations.  Justice is proof that you don't have to wait until you finish school, or get a degree, or turn thirty to make a difference.

What will you do one day?