text: However, further analysis revealed some other possibilities based on the characteristics of 
  those attending opiate/crack treatment for the first time in recent years. The Appendix includes a 
  series of graphs with age-of-onset distributions for those who first attended treatment in 2013, 
  and then 2012, and so on back to 2004. These show that the majority of those who presented to 
  treatment in 2004 initiated use in the mid-1990s in line with the likely peak of the epidemic. But 
  by 2012 a far greater number of individuals presenting to treatment say they started using 
  opiates/crack only a year or two before.23 In other words, there appears to be a shift towards a 
  shorter lag between initiation and treatment. This shift looks even more dramatic when using 
  proportions rather than absolute numbers, see the Appendix. 
  
  Furthermore, these individuals (those who seem to have both initiated recently and presented to 
  treatment within a year or two of initiation) show a notably different age-of-initiation profile 
  compared to the established profile in the literature, which peaks around 18–22 (Donmall & 
  Jones, 2005). These individuals have a notably older age profile: see figure 11 chart, which 
  compares recent initiates who presented to treatment in 2005 with recent initiates who 
  presented to treatment in 2013. 