At what age did jahonn sabastion bach start to play insterments?

No information is known about his musical education, so it is possible that he learned to play string instruments from watching his father. It may have been that he learned about harmony from his uncle Johann Christoph Bach, who was organist at the Georgen Church until 1703. Bach also learned to play the organ and harpsichord, and he became an expert at building organs.

Also, suggest you check your spelling when post