The annual headline figure for rough sleeping published by the Department, based on local authority street counts, does not include information on age profile.
Some information on the age profile of rough sleepers, covering London only, is available from the Combined Homelessness and Information Network (CHAIN) database which records information about rough sleepers and contacts made by outreach services with rough sleepers.
Data from the CHAIN database show that of the rough sleepers contacted by outreach services during 2008-09, 8 per cent. are 18-25 years; 26 per cent. are 26-35 years; 35 per cent. are 36-45 years, 20 per cent. are 46-55 years and 11 per cent. are over 55 years.
For part (b) of the question above, I refer the hon. Member to the answer I gave him on 15 December 2009, Official Report, column 991W.