I am so sorry to hear that, 51 years is a long time, losing a love one can't compare to losing money, and true at some point in life we all get our wake up call, and realize what was important and what wasn't.
Sorry for your loss!!! I know I would be nothing without my wife so I truly feel for you! My biggest fear is that she would pass before me someday. When your wife is your best friend as well as your partner life with her is over the moon amazing. Cherish the great times you had and the bad as it made you the couple you were. You will see her again someday!! Chin up!!