After analyzing the results, they determined severe loneliness occurred during three age periods: late-20s, mid-50s and late-80s.
» RELATED: Popular in high school? You may be miserable as an adult, study says
"This is noteworthy because the participants in this study were not considered to be at high risk for moderate to severe loneliness. They didn't have major physical disorders. Nor did they suffer from significant mental illnesses such as depression or schizophrenia, in which you might expect loneliness to be problematic," coauthor Dilip Jeste said in a statement. "Though there were clear demographic limitations to the group, these participants were, generally speaking, regular people."
The authors noted loneliness is associated with poor mental health, substance abuse, cognitive impairment and bad physical health, such as hypertension and disruptive sleep.
According to the team, this is the first known assessment of its kind, but they said more research is needed.
“There are more gaps in knowledge than there are answers at the moment,” said Jeste. “But these findings suggest we need to think about loneliness differently. It’s not about social isolation. A person can be alone and not feel lonely, while a person can be in a crowd and feel alone. We need to find solutions and interventions that help connect people that help them to become wiser. A wiser society would be a happier, more connected, and less lonely society.”
» RELATED: Loneliness increases your risk of Type 2 diabetes, study suggests