One thing I do not get, how can buds that just sprouted be 1000 years old, the tree sure, but the buds?
The buds aren’t 1,000yrs old; the tree might be. Many trees do this. I’m a Horticulturalist/Botanist and this is not unusual in Nature.
This is all by design. Just as some species like Douglas Fir are not SHADE tolerant. Which is why for the seedlings to grow you have to CLEAR CUT. Meaning the small young seedlings will NOT grow if they are in the shade of larger trees. Some species will ONLY repopulate AFTER a forest fire. Natures way.