Epson originally guesstimated a lifespan of "over 200 years" for their inks about 5-7 years ago. Since then, they have guesstimated "50-100 years" and "over 100 years" at various times. There's really no way to be sure and individual care of printed photos will make a huge difference.
Keep your prints out of direct sunlight. If they are to be displayed, use UV filtered glass in the frame.
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