Minimum recommended LED drive current
The properties of aging on transparent substrate LEDs have been documented in research by many but are not handy to me the time of this writing. I have known this for about 10 yrs so Google or Microsoft Scholar ought to have some papers on this. I got mine from EOS by NDA.

Generally 10% of rated max current is needed to prevent some corrosion of the crystal electrode interface. But then with 50kh given as expected min MTBF this has been greatly improved by many brand name suppliers  by quality controls to millions of hours if you want to use PWM dimming to 1% some of the time, that would be OK if 100% of the time was also experienced.

Heat generally has a positive aging effect initially only either by soldering or operating at rate temp for several hours or days.  This can burn off leakage R and sometimes crystalline-metallic shorts. (dendrites)