I've reposted this question in the B+W paper and chemistry forum where it is more appropriate.

Please forgive my ignorance, but what is the relative expected lifetime of black and white RC, FB, colour papers (there are diferent types) and digital prints (again there are different types)?
I have B+W prints made on RC paper back when I was at university (almost 30 years ago) that still look good, and have spent much of their lifetime displayed on walls, though not in direct sunlight.