Consider having the quality of some* natural items grow as the world ages. This would allow players that aren't around at the start of the world, or players that have lost everything, a chance to get back in the game. My suggestion would be to have the items quality scale just slower than the average player can raise them casually.
*Not all items would have to be affected by this. Certainly items that are meant to be early game foragers with lousy late game value could stay at q10, or possibly scale at a slower rate. The resources to target with this change would be things like trees, which have a downstream impact on many other item qualities, and also take a long time for a fresh-starter to grow.
Another consideration would be to have quality nodes (soil, clay, water, etc.) continue to spawn as the world ages, with slightly higher potential base qualities. This would also give older players a potential new carrot.