A Leader is not defined by years. Great leaders who ruled the nation where much younger than my grandpa!
It is about leadership qualities. Be wise, be gentle, be truthful. These are the first step to become a leader.
The second step is tendency to help and grow along, acquiring knowledge on the field of expertise and gradually learning more on the eco-system.
Third step is to be proactive, being grounded and focus on what you do.
Finally, you never have to promote yourself as a leader, your qualities will do.