I can't help but point to this: http://www.ehow.com/how_2070387_keep-aging-brain-active.html
Scroll down to where it says "Exercise the Brain". While I believe the 1st notation is obvious - exercise both body and brain of which I do to deal with it, not everyone has the energy to keep a regular physical regiment. However, I practically endorse #2: Keep your brain active every day. Play trivia games, do crossword puzzles, word games or read daily. and #3: Start something new to challenge your brain. Take up a brand new hobby, learn a new language or write a book. Get on the computer and research something that interests you, like genealogy or your family history.
To answer your question, sitting here and being an info addict are quite possibly two different things. It's all about prioritization and balance - in that case maybe a better question might be: could one instead be a HN addict?