As far as Ray and his 3pt numbers, no doubt age may be playing a factor, but I definetly do not thing its the only factor, or even the biggest factor.
In regards to Rays numbers over his career, remember, he was the #1 guy on those Miluakee and Seattle team, so he had the ball in his hands probably 2x 0r 3x as much as he has had now as a celtic.
So he always had a feel for the ball, the entire game, which is critical for a scorer. And even more critical for a scorer who is a shooter. (ex. a scorer=AI) (a shooter=Kapono) (a scorer who is a shooter=Ray Ray)
I see the numbers and all, but my thing is, its no secret, or surprise the most people see and believe that Ray Allen has been the most consistent of the Big 3, over the past 3 years, till now.
So I'm almost wondering, if Ray's "streaky shooting" being a topic of concern, is more of a result of Paul and KG's decline,Thus Ray Allens game is now sticking out, more than ever before and less of Ray all of a sudden being very streaky.
To me Ray has been consistent since he's been in Green. and by consistent I mean; he's always gone thru stretches of being streaky and his play has seemed to be at a similar level each year...
Ex.
Ray making the All-Star team for the last 3 years wouldn't raise any eyebrows.
Paul Pierce making the All-Star team the last 3 years wouldn't raise any eyebrows, but questions might arise about this years trip to dallas.
KG making the All-star team the last 3 years, the last 2 years would defintely raise a few eyebrows. (of course one was due to injury)
So I think Ray Allens isn't necessarily dropping off on a steep decline, but I think he is more noticeable now, because those around him (pp-kg) are declining at a faster rate than Ray.