An employee shall retire from the service of the company upon attaining the age of 58 years. What is the meaning of this? Does it mean the day of retirement shall be the last day of completing 57 years, i.e., one day prior to the birthday when 57 years are completed, and on the next day, the 58th year shall start? Or, is it the last day of completing 58 years, with the next day marking the start of the 59th year? Which option of the above is legally correct?