A survey of 8,580 people between the ages of 16 and 74 in the UK has found that younger adults are three times more likely to suffer from them than older people. However older people with suicidal thoughts were more likely to be suffering from depression. Tiredness with life and thoughts of death were also more common in the older group. For all ages having a small circle of friends, being divorced or separated and having poor health were all associated with an increased incidence of suicidal thoughts. Being single was an important risk factor for younger age groups while widowhood was an important risk factor for older people.
Dennis, Michael ... [et al] - The spectrum of suicidal ideation in Great Britain : comparisons across a 16-74 years age range Psychological Medicine June 2007, 37(6), 795-805