“EntrepreEntrepreneurship Knowledge, Challenges, and Sustainable Entrepreneurship Framework for Retirees: A Systematic Reviewneurship Knowledge, Challenges, and Sustainable Entrepreneurship Framework for Retirees: A Systematic Review: Introduction, Methodology, Result and Discussion, Discussion, and Conclusion. ”, IJIBS, vol. 19, no. 2, pp. 1–21, Dec. 2024, doi: 10.11113/ijibs.v19.161.