I joined before 1 January 1990/2014 and will reach 60/62 years old on or after 1 January 2018. What do I need to do if I want to leave before reaching 65 years of age and can this right be exercised any time after 1 January 2018?

French translation unavailable for I joined before 1 January 1990/2014 and will reach 60/62 years old on or after 1 January 2018. What do I need to do if I want to leave before reaching 65 years of age and can this right be exercised any time after 1 January 2018?.