At the end of the hotel scene, Nick says something that I have always found so strange. He says " I just remembered that today's my birthday. "I was thirty. Before me stretched the portentous menacing road of a new decade." Why would the decade ahead of him be menacing

This question refers to The Great Gatsby, Chapter 7.

Nick suddenly remembering is his thirtieth birthday works as an unexpected warning to himself about the unhappiness that lays behind the world he has involved himself in since he moved to Long Island.

Explanation:

After Gatsby begins an argument with Tom about Daisy, the infidelities and hostilities that have been long building up, finally explode, showing the real unhappiness the group shares. Nick fears that´s all his future holds.  

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