What age is appropriate to be left home alone?

Mariah • 26, 👼🏼 10/10 👼🏼 11/18. 🌈 baby due December 2019!! 💕
I'm wondering what everyone thinks. I really don't know what age should be acceptable to be left home alone, because crazy things happen everyday. I do not believe it is in anyway alright for a toddler to be left home alone without adult supervision but what age do you think is okay? 
(Sorry if there has been a post before on this I haven't noticed one, just thought about interesting topics!) 

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