We propose analyses of Ar-Ar systematics in grains that the Hayabusa mission collected from near-Earth asteroid 25143, Itokawa S(IV). Our main goal is to learn the Ar-Ar age but we may also obtain information about the extent of exposure to solar wind, and the cosmic-ray exposure (CRE) age at the surface. We will compare the Ar-Ar age(s) of Itokawa grains with the Ar-Ar ages of LL chondrites. Common ages may link Itokawa to a specific subgroup of LL chondrites. To prepare for the analysis of Itokawa grains we will analyze samples of comparable mass taken from several LL-chondrites.