A defendant’s youth may be considered only as a mitigating factor in sentencing and cannot support an aggravating factor. On resentencing, the sentencing court should consider mitigating factor fourteen -- that “the defendant was under [twenty six] years of age at the time of the commission of the offense.” N.J.S.A. 2C:44-1(b)(14). The weight to be given to that factor is within the sentencing court’s discretion.