Anxiety in England has risen for the first time since 2012 as middle-aged people worry about house prices and care homes.
Figures from the ONS show that anxiety experienced a slight increase between 2015 and 2016 due to a fall in the number of people who said they had very low levels of anxiety.
Analysts said the "squeezed middle" - those in their 40s and 50s - were worrying about both their parents and their children.
When asked to rate their anxiety on a scale from 0 to 10, where 10 is very anxious respondents to the ONS's survey gave an average answer of 2.92, an increase from 2.87 in 2015.
This is also higher that the data for 2014 and is the first year-on-year increase since 2012.
Experts said that the "euphoria" people felt following the end of the financial crisis had subsided and people had begun to feel anxious about their family's economic stability again.
Dr Eugenio Proto, an economics professor at Warwick University, said: "People are less obsessed with the crisis and are more worried about usual problems like welfare and house prices.
"That sense of relief is going to be over and they start to look at problems which have always been there but are now becoming more acute," he said.
Analysis by pension company Aviva found that those in their 40s and 50s had been the least happy and most anxious of any age groups over several years.
Alistair McQueen, head of savings and retirement at the company, said that high levels of happiness were concealing underlying anxiety.
"Our sense is that rising anxiety is being caused by economic insecurity.
"Those in their forties and fifties tend to feel less happy and more anxious, and it's because of those economic factors," he said.
Professor Cary Cooper, of Manchester Business School, said that middle-aged people were also more concerned about job insecurity, which has become more of a worry following the financial crisis.
"The 40-plus generation will worry about job insecurity, which is something millennials worry about less," he said.