Are you asking me? If so, what has light years got to do with radiometric dating methods, and assumptions that drive Macroevolutionary a priori opinions?
The light-year has everything to do with the fact that the universe is older than claimed in that mental barf performed by Bishop Ushher back in the 1600s.
How did light from stars/galaxies far more than 6000 light-years distant from us reach Earth?