Final answer:
Pablo Picasso was about 19 or 20 years old when he moved to Paris. This move marked the beginning of his Blue Period, transitioning to his profound influence on modern art through the development of Cubism.
Step-by-step explanation:
Pablo Picasso, the famous Spanish painter, moved to Paris when he was 19 years old. Looking at the dates of Picasso's life (1881-1973) and knowing that he moved to Paris at the very beginning of the 20th century, we can determine that he made the move around 1900, as his Blue Period started in 1901. Considering that Picasso was born in 1881, this would place him at about 19 or 20 years old when he made the significant move to Paris, France.
Despite misconceptions about his ability, Picasso was already an accomplished artist by a young age, having mastered the techniques of academic art. His move to Paris ushered in new phases in his artistic career, including his Blue Period and later developments like Cubism.