Players since 1980, 240+ lb., 150+ HR, .260 or worse BA (not exhaustive): G. Stanton: Declined markedly at 32. A Dunn: At 31. R Howard: At 32. C. Davis: At 30. G. Sanchez: At 27. M. Sano: At 27. P. Alvarez: At 30. J. Bell: At 30. L. Duda: At 32. C. Carter: At 30. J. Gallo: Outside of power, never really got good enough offensively to have been capable of declining markedly. To answer your question about trading people, yes, I'm all for it if that means building a core that will actually win in the future, more than one year in a row at a time. But they've been chasing that ghost since I've been following the Mets so maybe that will never happen.