THE Blackrock Clinic is 10 years old this year, and its 1996 series of public lectures on a variety of health issues begins tonight with a session devoted to men's health, including prostate cancer and the male menopause. There is no admission charge to the sessions, which begin at 8 p.m. and take place each Tuesday. However, it is advisable to book a place by writing to the clinic or telephoning (01) 2832222. Between now and April 16th topics to be covered include the psychological aspects of chronic pain, food allergies and becoming a healthier person.