I'm new to this forum and am not technically minded at all when it comes to DIY etc, so please excuse me if I sound like a complete fool by asking this question..!

I've tried using the search function, but couldn't find an answer that way.
I live on the fifth floor of an apartment building and it's recently come to my attention that there are quite a few long, and seemingly deep, hairline cracks on the ceiling of my apartment. Some are two or three feet long and I'm able to slide a straigntened paper-clip the entire way in - so they're at least a few inches deep and possibly a lot deeper. Some are found above doorways, others emerge from the corners of what I can only assume are support columns?
I will mention it to the management of the building, but I'm not at all concerned about the asthetic side, more the safety of the building. Should a building only about 5 years old have such things? They're not only in my apartment, but in the public areas like the lobbies too.
Any input greatfully received!!!