I'm fairly happy with where I am in life, and as a Gay of A Certain Age, I might be more worried about not finding anyone, but it's not keeping me up at night, My sleep apnea does that, thank you.
If you are a person who is Dying Alone With Me and are TRULY afraid of dying alone, there may be something you can do about it. I found this helpful list of 11 Signs That You're Going To Die Alone and there's advice on how to avoid it. SPOILER ALERT!
I'm guilty of #2 & #3, but I'm still not worried.