Data from the Samaritans and the Office of National Statistics show that whilst rates of suicide fall as you approach 65 there is a second peak at 85 and older (especially among men). It should be noted that these figures are for suicides resulting in death, not unsuccessful attempts, nor do they differentiate methods. However the bi-modal peaks are a phenomenon worth knowing about.

This study of patients admitted to hospital with an overdose found that 4.5% were over 60 years old:

"Older patients were also more likely to ingest cardiovascular drugs, including beta-blockers, calcium channel blockers, diuretics, nitrates, statins and antihyperglycaemic agents".

They also found that the duration of hospital stay was longer in older patients, and this group had a higher mortality rate.