"28 As for age, paragraph 1.5 of the Sentencing Council Guideline for Sentencing Children and Young People reads: ' ... Children and young people are not fully developed and they have not attained full maturity. As such, this can impact on their decision making and risk-taking behaviour. It is important to consider the extent to which the child or young person has been acting impulsively and whether their conduct has been affected by inexperience, emotional volatility or negative influences. They may not fully appreciate the effect their actions can have on other people and may not be capable of fully understanding the distress and pain they cause to the victims of their crimes. Children and young people are also likely to be susceptible to peer pressure and other external influences and changes taking place during adolescence can lead to experimentation, resulting in criminal behaviour.
'Reaching the age of 18 has many legal consequences, but it does not present a cliff edge for the purposes of sentencing. So much has long been clear. The discussion in R v Peters[2005] EWCA Crim 605 ,[2005] 2 Cr App R(S) 101 is an example of its application: see paras [10]-[12]. Full maturity and all the attributes of adulthood are not magically conferred on young people on their 18th birthdays. Experience of life reflected in scientific research (e.g. The Age of Adolescence: ...17 January 2018 ) is that young people continue to mature, albeit at different rates, for some time beyond their 18th birthdays. The youth and maturity of an offender will be factors that inform any sentencing decision, even if an offender has passed his or her 18th birthday. ... ' 31 More recently in R v ZA[2023] EWCA Crim 596 ("ZA"), at [52] May J, Judicial Lead for Youth Justice, said this: '