I have to disagree...sort of.
I agree that the photographer must take all the necessary steps to safeguard the work, in order to make the work last.
I print in the darkroom, double fix and selenium tone my prints. This is a proven method of archival printing and longevity.
Now on the other hand, we have Canon, Epson and HP, and whomever else, telling us that their inks and papers will last for X number of years. How do we know they will? Because a large corporation tells us or because some independent company comes up with a system of testing that says the prints will last so long?
I am not convinced.
About a year ago or so, Canon ran an ad that said their prints (their paper, printer, ink) would last a lifetime. After the word lifetime, came an asterisk. In the smallest print I've ever seen, it said based on keeping the print, in a dark, temperature and humidity controlled environment, it would last for 60 years ( I think that is what it said).
Where do you keep your prints? Is your home or office always temperature and humidity controlled?
The only answer to this is time. Plain and simple.