Part 2 is a multiple ascending dose subject- and investigator-blinded study comprising 3 cohorts with each 12 healthy young (aged 25 to 55 years) female subjects and 1 cohort with 12 healthy elderly (aged 65 years or older) female subjects who will receive ASP2205 or matching placebo. Nine subjects in each cohort will be treated with ASP2205 and 3 subjects will be treated with matching placebo (ratio 3:1).