The RJD chief cut a 65 pound cake in the shape of the party symbol at the official residence of his former chief minister wife Rabri Devi.
Prasad was offered the first slice by Rabri Devi.
The RJD chief shared the cake with state RJD president Ramchandra Purve, national general secretary and MP Ram Kripal Yadav and party leaders and workers.
The RJD chief goes by June 11, 1948 as his date of birth according to his educational documents.
Image: RJD chief Lalu Prasad exchanges cake with wife Rabri Devi during his 65 birthday celebration at his official residence (PTI)