Sorry for your loss. I lost my father when I was in my early 30's to colon cancer. Then lost my mother 3 years ago also to cancer. I'm 51 and can say it is always hard when a parent passes away. But we go on. Be glad for the time you had to spend with them and keep them in your heart. Remember the love you shared with them. As the saying goes "time heals" but you will always have a piece of your heart that longs for them.
For me the worst time of year is around Christmas. I can't set up the Christmas tree without remembering all the years doing it with my mom and having a tear in my eyes thinking about her. Actually have a tear in my eyes just typing this. Hope all goes well for you and always remember there is nothing wrong with missing her.