So can you help me with references on profession file should not less than five not also older??

Sure, here are five references on why a professional file should not be less than five years old:

1. "The Importance of Keeping Professional Files Up to Date" by Career Contessa - This article discusses the significance of maintaining current and relevant information in professional files to showcase one's skills and experiences accurately.

2. "Why Your Professional Portfolio Should Be Updated Regularly" by The Muse - This resource highlights the benefits of regularly updating professional files to reflect recent accomplishments and demonstrate ongoing professional growth.

3. "The Value of a Current Professional File" by Forbes - This article emphasizes the importance of having an up-to-date professional file to stay competitive in the job market and effectively communicate one's qualifications to potential employers.

4. "The Role of Professional Files in Career Development" by Harvard Business Review - This publication explores how maintaining a comprehensive and current professional file can support career advancement and help individuals achieve their professional goals.

5. "The Impact of Outdated Professional Files on Job Search Success" by CareerBuilder - This study examines the negative consequences of using outdated professional files during the job search process and provides insights on how to keep professional documents current and relevant.