It's a familiar tale.
The Pharisees brought to Jesus a woman caught in adultery. They asked if she should be stoned. Jesus (after a bit) said "Let him that is without sin among you first cast the stone at her." After they left, Jesus said this:
John 8:11b (Darby)
And Jesus said to her, Neither do I condemn thee: go, and sin no more.
Final verse for my question:
1 John 3:9 (Darby)
Whoever has been begotten of God does not practise sin, because his seed abides in him, and he cannot sin, because he has been begotten of God.
Is it possible to live a sinless life? Is it possible that any person can come to God, be forgiven of their past sins and actually sin no more?
The implied question: Is it possible that some person X may actually be free from sin and, therefore, no longer a sinner? (Examples: the pope, politicians, random guy on the street, the Virgin Mary when she was alive, the prostituted in Jesus' days, etc.)