The original meaning of Aryan (English term Aryan derived from Arya) term was a self-identification of people who spoke Indo-Iranian languages such as Ossetians, Persians Kurds, Pushtuns, Tajiks and others. Indo-Iranian speakers belong to different races in anthropological context. German Nazi distorted the meaning of the term Aryan. : http://en.wikipedia.org/wiki/Aryan
Lithuanian and Latvian languages are no older than other European languages. What makes Latvian and particular Lithuanian more similar to Sanskrit and early Indo-European languages than other modern European languages is archaic linguistic features that two Baltic languages have retained.