What is the average 401k balance for a 65 year old?

Could you please elaborate on the average 401k balance for a 65-year-old individual? Is there a specific range or a median value that we could consider? How does this balance typically compare to other retirement savings vehicles or to the overall financial goals of retirees? Additionally, are there any factors that can significantly influence this balance, such as career choices, investment strategies, or market conditions?