I used to be able to do that when I was young, it was great. Now, it is much harder to block everything else out, I would be so much more productive if I could

I used to be able to do that when I was young, it was great. Now, it is much harder to block everything else out, I would be so much more productive if I could do that. Of course, you need a break every now and again, and not eating/exercising is going to catch up with you, but I am guessing this guy is quite young.