Some netizenpeople on the internet said that men over 40 are eager to teach young people something even when it is not requested.

I do not think most people know what "netizen" is (I had to google it).

I recently had an experience tohat convinced me that this idea is true.

My former boss has a lot of experience and knowledge in business matters soand because of that I admire(d) him.

You say former boss, so you might need to change this to past tense and the sentences after this with him.

However, Hhe has been annoying because he cannot stop exposing his knowledge as he is about to his 40s these days.

However, it is still frustrating for us that he blocks our schedules and gives lectures to the extent that it is not necessary for our jobs.

People are to be willing to teach something regardless of their ages.

Some people may just let others know their effortwant to share about their struggles.

From your native text:
単に、自分の苦労を知ってもらいたい場合もあるかもしれない。

I think this is what you are trying to say.

So, it would be tough to be reticence by fighting against instinct.

PThe person I respect most is my grandfather.

Everybody respects him as he is always polite.

Sharing Knowledge

I recently had an experience tohat convinced me that this idea is true.

My former boss has a lot of experience and knowledge in business matters so that I admire him.

However, Hhe has been annoying because he cannot stop exposing his knowledge as he is about to his 40s these days.oversharing his expertise. He also happens to be in his 40s.

He isn’t oversharing because he’s in his 40s. He’s just giving unsolicited advice.

It may be a reason that I am used to my am annoyed because am familiar with my own work and don't require basic knowledgetraining on the basics any more.

However, it is still frustrating uIt is frustrating to myself and my colleagues that he blocks out our schedules andto gives lectures to the extent it iswhich are not necessary for our jobs.

If he’s a former manager, how do they have the power to do this?

I suppose that men have this tendency more than women does.

People are to beoften very willing to teach others something regardless of their ages.

It feels good whento be respected as a teacher and we hope that our experience and knowledge helps others.

Some people mayare just overeager to let others know their efforts. without being asked.

It is terrible for people who are forced to listen to their stories.unsolicited feedback.

I believe that sharing knowledge is one ofa human's instinct.

So, it wouldcan be tough to be reticence by fighting against that instinct.

PThe person I respect the most is my grandfather.

He haves never told his storyovershared even though he suffered in the war and started his own company from scratch with his incredible hard work.

He has humility.

I hope to be a person like him from the bottom of my heart to become someone like him.