Why have so many of my friends died by age 45, and is this normal?

I'll be 45 next month and all my friends are dead. I was popular in the best decades for friendship 1980 through 1999. I had so many close friends nobody knocked on my door they just walked in. I didn't make plans they just showed up at my house because something was always happening. This 4th of July my first love and one of my best friends died. I have 2 friends left. Everyone is dead. I feel a little too young for this to happen. My grandparents went through World war II and still had friends attend their funerals. If I don't make more friends or the last two don't die I'll have the most pathetic funeral ever... And it can't come soon enough
Why have so many of my friends died by age 45, and is this normal?
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