Respected sir, I masturbate at least 4-5 times a day. I am single and 19 years. I feel like having sex really badly. Is there any way I can overcome it and concentrate on my studies. I have attraction even to elder ladies who are in their 30s. What do I do to overcome all these?

Masturbation is normal physiological act. You may read about masturbation related answers by typing masturbation in search box of this site.
Looking at your daily frequency of masturbation it seems that you are compulsive masturbator. You need to practice self control to reduce its frequency. Having an attraction for women in their thirties is a matter of personal preference, nothing abnormal about it.