Ugh!
I've seen the Wilhelm research tests about print longevity for Epson Exhibition and, compared to Hahnemuhle, it seems not that bad - nevertheless I tend to believe users feedback more than official reports
Yellowish paper sounds really bad.
Anyway, the tests aren't the very same (Hahnemuhle are tested with K3 inks, and Baryta wasn't among the papers - Epson Exhibition is with Ultrachrome HDR), but as a comparation:
Epson Exhib (displayed prints framed under glass): 90 years
Epson Enhanced Matte: 82 years
=======
Hahnemuhle (same conditions):
Fine Art Pearl: 82
PhotoRag Satin 68
PhotoRag Pearl 64
PhotoRag 60
As a sidenote, the only paper from Epson I've found as a 64" roll are the Exhibition and the Enhanced Matte - what a choice...
It really seems that Epson 11880 printer has 4 extra inches that nobody likes to fill...
Regards
Davide