This is a part that gives me pause. I find it almost unfathomable to think that as an adolescent, he did not sin (by thought, word or deed). Granted, I believe he asked for forgiveness daily; but if he had cast no sin; what would you beg forgiveness for? If he married, then sex is no sin; for are we not commanded to 'Go forth and multiply'? Is striking out in violence and physically rebuking another sinner a sin? Then, was Christ's (justified) outburst against the money-changers in the temple a sin? I think he lived the perfect life, in that he accomplished his goals, as only the Son of God could, but ascribing a sin-less quality is not scripturally represented. This is an attribute that has been attached to Christ by man.
Why would the off-spring of Jesus be considered 'perfect'. Granted, it's pretty hard to trump the lineage; but regardless of your ancestry, you have Adam and Eve to thank for the propensity to sin.
More significantly, Christ was judged in the Cross with the sins of all mankind imouted upon Him. Had he not been sinless, upon His descension into Hades, the Perfect judgment of the Father would not allow His ressurrection nor His ascension. Likewise, the Holy SPirit would not have had the freedom to raise Him from the dead and rejoin the soul with the body.
Morality is not an issue of sinfulness, but an issue of good and evil. Sin was judged on the Cross, but good and evil are resolved over time.
Truly our Lord and Savior Christ Jesus was not only sinless, He lives today as God and as man and remains obedient to the Father and in that sense, sinless, although he was sin for us in the eyes of the Father.
Some thologies discuss the 'old sin nature', or 'the natural man', or the old self, when discribing that nature we have within our selves,..a propensity to sin.
This was not in Jesus Christ. This is not to be confused with temptation.