There's no definitive answer to when William Shakespeare stopped writing. We know he retired to Stratford-upon-Avon around 1611 and that his last play, "The Two Noble Kinsmen," was co-authored with John Fletcher in 1613. However, there's no record of him stopping writing entirely after that.
Some scholars believe he may have continued to write privately, while others speculate he may have simply chosen to focus on other pursuits in his later years. The mystery remains, adding to the intrigue of this great playwright's life.