Is it Alcohol or Age?

I am 31(M), have been binge drinking over the weekend, (typically Friday’s and Saturday) for last 6 years. I’m not sure if it’s alcohol or age but I feel like my brain is damaged.

Just a little background about me: I am fairly inteligent, and have done ok academically and do well at work. I work in sales for an MNC bank. I’m am ambitious and serious about my work. Not a fitness freak but I do lift weights 2-3 hours per week on and off since last 8 years.

I’ve noticed following symptoms in the last 2 years 1. Difficult in remebering things (specially names) 2. Motivation levels have gone down ( I think my hangover affects the will to do things) 3. Difficult to articulate things 4. Things take longer to start 5. Cannot keep up with the songs while singing, could do that before, but now lyrics come slower to me. (I’m not concerned about not being able to sing but more for my brain)

Question: 1. Is it the effect of drinking or is it normal for my age? 2. What can I do to reverse it?