You are right that there is no age of retirement exists at present in Model Standing Orders. The provisions of retirement age were inserted in the Model Standing order in eighties or nineties but subsequently this was repealed. Normally the industries have their own standing orders which prescribe age of superannuation. If the industry does not have its own standing orders model standing orders prevails and since Model standing order contains no provision regarding retirement age, earlier the employee had a right to continue in the employment till his death or resignation, However, his services could have been terminated after complying the conditions precedent to retrenchment as laid down in section 25F of the Industrial Disputes Act but recently the Apex Court has held that an employee has no right to continue in the employment after 60 years.