There’s an old Latin saying, “Qui docet, discit” (He who teaches, learns.)
You don’t need to wait until you have a teaching certificate, a particular degree, or gray hair to pass on knowledge and skills and inspire others. Volunteer to become a mentor, either formally through a program at work or school or informally.
You know more than you think you know; you bring your own unique set of skills and life experiences to the table. If you don’t know the answer, merely reply, “I don’t know but I’ll find out.” (You might even approach each day with that very question.)
The best teachers don’t preach to others, they learn from others.