"While the retirement age for nationals in public sector jobs is 60yrs, there is no age limit for retirement for employees in private sector jobs. Here, people well above the age of 60 or 70yrs continue to work in private sectors.

The only problem in private sector is that sponsorship change is not allowed for expatriate employees over 60yrs of age, and written requests are made to renew their visas."
http://www.onlineqatar.com/living/Retirement-age-Qatar.aspx