Somewhere tiwane said - 100 years was a ‘random’ number to allow for expecting the observer / photographer to have been Alive Then.
The new help, with my bolding, says
- the community agrees the observation doesn’t present recent (~100 years) evidence of the organism (e.g. fossils, but tracks, scat, and dead leaves are ok)
An obs is meant to be - My photo - taken by me - I was there - then. So, a hundred years is optimistic.
https://forum.inaturalist.org/t/what-is-your-oldest-observation/27766
https://forum.inaturalist.org/t/oldest-observation-date/19063/2