Will a young man's addiction to masturbation with such intensity and for such a long period affect his marriage and cause him to suffer from premature ejaculation, and is there a solution for that?

Masturbation is a forbidden act from which one must repent immediately with sincerity and devotion. Sincere self-struggle helps in abandoning it, as a confirmation of the Almighty's saying: "And those who strive for Us – We will surely guide them to Our ways." Among the things that help in repentance are avoiding places that arouse lust, lowering the gaze, frequent fasting, hastening to marry for those who are able, associating with good people, constant remembrance of Allah and supplication, attending knowledge gatherings, occupying oneself with beneficial things, and guarding one's thoughts. Do not despair of repentance even if the sin is repeated. Regarding the fear of premature ejaculation, refer to the consultations section on the website; its treatment is easy, Allah willing. So, hasten to marry, have good expectations of your Lord, and if you face health problems, consult trustworthy doctors.