Karl Marx was only 29 years old when he wrote the Communist Manifesto

When you do your research on Karl Marx and Friedrich Engels as it relates to the communist Manifesto what should stand out to you was their ages. Karl Marx 29 years, 9 months, and 17 days old when the Communist Manifesto was published, Friedrich Engels was 27 years, 2 months, 25 days old.
I find a lot of flaws in their arguments and now that I’ve begun doing my history on these two characters, I’m beginning to get a clearer understanding as to why they came to the conclusions they came to!