The ages of field stars given in the catalogue of Cayrel de Strobel et al. (1985) are derived by the five different methods with combination of theoretical isochrones. By using these ages and metal abundances homogenized by Lee and Choe (1988), the age-metallicity relations are obtained. For disk stars of [Fe/H] > -0.9, the present age-metallicity relations are nearly consistent with those given by Twarog (1980) and Carlberg et al. (1985).

ABSTRACT
    I. INTRODUCTION
    II. DETERMINATION OF AGE
    III. AGE-METALLICITY RELATION
    IV. CONCLUSION
    REFERENCES

• LEE SEE-WOO(Department of Astronomy, Seoul National University) | SUNG HWANGKYUNG
• ANN HONG BAE(Department of Earth Science, Pusan National University)
• SUNG HWANGKYUNG(Department of Astronomy, Seoul National University)