A person living alone could be:
Living alone allows for increased independence, privacy, and the freedom to make decisions without having to consider others.
An ecologist studies how living organisms interact with their environment.
The name for a non-living thing is abiotic
coexists
a runaway
A "hermit" is a person who chooses to live alone
If you are asking does Incompetent mean living alone....No it does not. In fact it would be really hard for an incompetent person to live alone for very long.
One who performs alone is a soloist.
A person who desires to live alone is often referred to as a "solitary" or a "recluse."
Troglodyte
A soloist.
Leave this person alone.
Nonfamily Household
Not sleeping alone, Good company, share expenses
Living alone allows for increased independence, privacy, and the freedom to make decisions without having to consider others.
Lumberjack!
a person who chooses to live alone is a hermit.