206 Years
15 years old
Ronald de Boer, who has played for Barcelona and Rangers.
He has been a Barcelona player from the start.
You must be 17 years old
Messi came to Barcelona when he was 12 years old or 13. Barcelona saw his talent in Argentina , but as he had hormone problems Barcelona spent the money on his treatment, and they are reaping the harvest. Messi has made it clear he will be a Barcelona player for life.
22.
Messi joined Barcelona as a teenager, and had hormone trouble.And has played for Barcelona who treated him.
It was the 22 year old Messi of Barcelona.
Leo Messi moved to Barcelona at the age of 13 years old, as they were the only club in the world that offered to cure his hormone problem.
Andres Iniesta was only 12 years old when he played junior soccer, but when he was 18 he joined Barcelona youth team and eventually to Barcelona team itself.
I believe 19 or 20