One more data point:
Bought a second-hand Warmoth bass in 1996. No idea how old it was at the time, but, as the setup was perfect when I got it, I did not adjust the trussrod then.
In 2004 I decided to "repurpose" the body for a different instrument, so I removed the Warmoth neck and stuck it on a shelf in my closet
...where it remained for the next eleven years!
Then in 2015 I got a new Warmoth body, attached this old Warmoth neck to it, strung it up, and have been using that bass fairly consistently since
And I still haven't had to touch the trussrod.
Bought a second-hand Warmoth bass in 1996. No idea how old it was at the time, but, as the setup was perfect when I got it, I did not adjust the trussrod then.
In 2004 I decided to "repurpose" the body for a different instrument, so I removed the Warmoth neck and stuck it on a shelf in my closet
...where it remained for the next eleven years!
Then in 2015 I got a new Warmoth body, attached this old Warmoth neck to it, strung it up, and have been using that bass fairly consistently since
And I still haven't had to touch the trussrod.