1. Men or women, aged 18 to 50 years inclusive (healthy young subjects) and > 65 years inclusive (elderly subjects) on study day 1. Women of nonchildbearing potential may be included if they are either surgically sterile (hysterectomy and/or oophorectomy) or postmenopausal for ≥1 year (with estradiol ≤25 pg/mL[92 pmol/L] and FSH ≥40 mIU/mL) and must have a negative serum pregnancy test result within 48 hours before administration of test article. Women who are surgically sterile or post-menopausal must provide documentation of the procedure by an operative report or by ultrasound and have a negative serum pregnancy test result within 48 hours before administration of test article.