If that’s the argumentation then Postgres is over 22 years old which makes it over two times better? On the other hand Windows is over 30 years old and it still hasn’t fixed many issues which for me are the reasons why I don’t want to have anything to do with it.

I'm not saying MongoDB is better because it is old, and I was rather hoping you would elaborate. For all I know, you could have had issues with it yesterday or 9 years ago.

I haven't tried it in 4 years myself. But I invested in a company that just launched their product two months ago and already regrets building it on Mongo.