That depends on whether you consider NetBSD forking (founding) itself from the Patchkit work (ostensibly to focus on support for non-PC hardware) means that it is older than the project that it forked from. That will depend on whether you think of FreeBSD starting when the name was changed (a recognition that 386BSD was never going to incorporate the patchkit into a new release) or before then, when the project of supporting and developing 386BSD started.
(I had a nice little 386BSD 80486 workstation at the time, forked to NetBSD for a while, before switching back to FreeBSD a bit later. The rest of the research group were Decstations, X-terminals and a couple of big Sun and Sony boxes, while a few weird, feeble networked PCs running DOS or Windows were starting to invade.)