There is a word for the meaning "Something is about to happen" and it ends with "age". And I have not used it for a very long time so forgot it. Can someone help me out with it??
As noted in (possibly ephemeral) comments, the OP was seeking the word presage, defined in Merriam-Webster as:
1: something that foreshadows or portends a future event : omen
2: an intuition or feeling of what is going to happen in the future
3 archaic: prognostication
4: warning or indication of the future