When I say "the system is 15 years old" what I mean is that there is a continuity between the Pentium-III-550 with 128MB RAM -- running Debian 3 on a spinning

When I say "the system is 15 years old" what I mean is that there is a continuity between the Pentium-III-550 with 128MB RAM -- running Debian 3 on a spinning IDE disk -- and the i5-4570 on my desk now with Debian 9.8 on 16GB and ZFS on two SSDs. The software has been continuously upgraded, the hardware has been occasionally upgraded; everything is up to date, but if I did something exciting to /etc/fonts.conf in 2014, that's probably still there.