also people who are retired _usually_ already own a place to live in so they don't spend money for rent/mortgage. OTOH, a 17yo will probably have less health-related expenses.
I would argue that you probably can, but not anywhere one would actually want to live in or where there is any sort of opportunities. For Finland that level means living in even poorer than average conditions in essentially dead areas.
Also not saying it's a great idea, but a remote worker could live there just fine. Technically, I mean. But why staying in a dead area if you can travel for the same money? So the dead area will probably stay dead... (and let's not get into that)
I said most of Europe, not all of Europe and the UK is known for being one of the most expensive countries in Europe. Same for Scandinavia, Belgium, Netherlands and Denmark.
But there are like 20 other countries in Europe where it is totally possible. Don't judge everything based only on you backyard.
Im in the UK so I work in pounds. 800 Euro = £684.29
I guarantee you that you cannot get house, bills, and food for this amount per month.
I actually think its a pretty smart and cheap way to live if you are young and can handle the requirements.