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The article estimates the age of the rocks of Solzan granitoid massif of the Khamar-Daban Province in Baikal, Russia using uranium-lead dating method. It analyzes the composition of the massif in the eastern which include granodiorite-gneiss and granite with amphibole, biotite, or garnet in dependence on the composition of host gneiss. It examines the accessory zircons that were extracted from samples representing biotite and garnet-biotite biotite leucogranites of layered bodies from the eastern part of the massif. It cites the uranium-lead dating of zircons which showed that magmatic zircons from granite melts in the Solzan massif started to crystallize 516-515 million years ago.