The retirement age is subject matter of Standing Orders, very important and noteworthy aspect from regulatory points.You have to refer your company's certified standing orders if its in place.If not then , age of retirement is 60 years as per Model Standing orders.You can have two sets of service rules-one set of service rules to cover up workmen and non management cadre of employees and second set for management staff. Accordingly you can retire the workmen and non management employees on attaining 58 years only when it is a clause under certified standing orders , not otherwise. 65 is very high , so you can amend certified standing orders if it is available to make it 58 years. If you do not have any certified standing orders as yet, its an opportunity to get the same and other provisos drafted nicely and apply for certification. To have SO certified, strength of employees of your establishment should be 50 as per directions from state of UP Govt. In HP,strength is 50 for applicability of Model SO Act, announced by notification dtd.10/10/1983. The name of Act is Industrial Employment(Standing Orders) Act,1946 (Model Standing Orders called for sake of brevity). Many smart organizations have changed and devised new one and are successfully doing work. Nowadays I am drafting SO for one of my client having plants in Baddi, Assam and Uttaranchal. You can seek any support should you have any where anytime.Procedure for certification is simple and also explained under Act.Certifying authority, normally a DLC, fixes one or 2 dates to ascertain along with workers representatives that draft SO matches with the guidelines of Model SO, and workmen representatives do not have any objections.On his satisfaction, it is certified and in case there he noted something contrary, you are given a chance to justify the changes or make it according to provisions which otherwise you have been working with those stuffs until today.