Why do you need to be a mentor?

Is it a relevant question for you?
Are you sure?

“If I have seen further than others, it is by standing on the shoulders of Giants” — Sir Isaac Newton.

I started mentoring and teaching formally in a very early stage of my professional growth. 
It started with the feeling that I could contribute from my experience and be able to teach and articulate to different people with different inspirations.
I can’t obscure that getting the title of the lecturer was very compelling, but most of this decision is based on my desire to pass on some of my knowledge and experience to others.
Explaining complicated concepts and in-depth technics allowed me to “order the disorder” – to put together all my knowledge in an attractive, understandable package for myself and others. It felt like I have learned things anew, with a different perspective and value.
Things that looked less important suddenly became crucial and essential to be explained and implemented.
With all those technical assignments, psychological and business-wise disputes, and hands-on projects, I felt like I am getting more professional in a domain I have come to teach.
It is a win-win situation when you can help others gain specialization (or maybe expertise), give professional self-confidence, and share my past experiences. Besides, self-reassurance always was such a thrill.

Do I need to become the wise Yoda (an old figure with lots of wisdom attained through years of experience) before I mentor someone?
According to the “Mentoring — a win-win situation.” article by Shraddha on Medium, you can become a mentor at any stage of your life or career. The whole point is to help someone through your experiences. You can mentor a junior college student if you are a university student, and you can mentor the previous two if you have just joined the industry. If you have been in the industry for quite some time, you can mentor all three mentioned earlier. You can seek a mentor if you decide to start your own company. And as a mentee, do not shy away. Don’t be scared or fearful. Just ask!

So today, I am getting mentoring from another professional, giving much mentoring to most of my employees, and once in a while, committing to lead or participate in a professional course in a college or another school (in my case, that would be UX Design, Management and other domains I can help with).
That means an omnidirectional way of getting “win-win” and giving “win-win.”

Do you mentor? In which field or profession?