Memory loss

I don´t know what is wrong with me. I realized that lately there are pieces missing in my memory(no, it is not alcohol related) and that had never happened before. Usually when I focus I can find lost stuff just by remembering exactly where and when I last had it. My memories sometimes go as far as describing the exact clothes other people wore, the weather on a particular day or what kind of food I ate. But now I am not able to remember doing even the simple things. Has my brain given up? Or is it just a part of getting older and eventually senile?