Why haven’t we seen Jack Nicholson in any films lately?

As of this writing, and despite numerous rumours and internet obituaries, Actor Jack Nicholson is still “alive and Kicking”.
Mr. Jack Nicholson, at 77, had mentioned he was going into retirement, lived at his home in Hollywood, still played golf, but has not done any new film work lately.  He has a cook and secretary, and his 5 grown children look in on him.  It is suggested (in the media) that he is having problems memorizing lines, and that is keeping him from making more films.  My personal feeling is that there are not enough roles for Jack Nicholson at this point in his career, and that would also be a factor.  Here are some articles on his career and private life:
Jack Nicholson – Wikipedia
Jack Nicholson biography – Amazon Books
Jack Nicholson in 1976 from Wikipedia page
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