SUICIDES among Hongkong Chinese teenagers have more than doubled, while the highest number of suicides are committed by the elderly, according to new figures released by a charity organisation. Although the overall number of suicides fell last year, The Samaritan Befrienders Hongkong yesterday reported deaths among 10-14 year olds had risen from four in 1991 to nine in 1992. In this age group, twice as many girls committed suicide. Suicides among teenagers aged 15 to 19 had increased by 92.5 per cent - from 16 in 1991 to 30 last year, while 168 people over the age of 71 killed themselves last year, 10 more than in 1991. Samaritans chairwoman Betty Tsui said more attention had to be paid to youths and the elderly. She said the organisation is focusing on preventing teenage suicides, and plans to run educational programmes for parents. The Samaritans also run a special Summer Hotline Service to handle calls from HKCEE candidates. Telephone lines are doubled, and volunteers triple their working hours from two to six per week to provide sufficient manpower. ''Reasons for students committing suicide include pressure at school, love affairs and wanting to avoid failure. Family problems are also a crucial reason,'' said Ms Tsui. She said the phenomenon of old people committing suicide had been neglected. Government statistics show more than 45 per cent of all suicides were committed by people aged over 55. She called for the Government to pay special attention to welfare for the elderly and to provide more housing, free medical treatment, counselling centres and centres for the aged. Love is the most common cause of distress for Samaritan hotline callers. More than a quarter quote failing relationships as the reason for their unhappiness. The majority of these callers are women. Family disputes account for almost 20 per cent of calls, while job problems instigated calls from 15 per cent of clients. Calls about sexual problems and sexual violence accounted for more than 12 per cent of all cases. Ms Tsui said this reflected a lack of sex education among young people. A total of 735 people committed suicide in 1992, 13 less than the year before. There were 121 more male suicides, and male suicide rates were higher in all age groups. Of the deaths, 59 per cent of people killed themselves by jumping from a high place, 28 per cent by hanging, seven per cent by poisoning with medicine and gases, and three per cent by jumping into water. Only 1.5 per cent of suicides were committed by injury with cutting instruments. More men chose to kill themselves this way.