Light is a wave and a particle which travels through a distance through space over a time.
Its speed can be measured accurately. We also know the distance to the stars and thus can find out how ling it takes for light to arrive at an observer.
https://en.wikipedia.org/wiki/Speed_of_light#Measurement
Yes, the speed of light can be measured. The distance of stars cannot be measured. Given Einstein's lot says heliocentrism and geocentrism cannot be confirmed by science, then the distance of stars, calculated only by the heliocentric method, is mere speculation.
Your Big Bang age for the stars then, cannot be confirmed. But if one believes in God's Word then all stars were created visible on Earth immediately which means one cannot age the universe by the stars. The only diastance-age man's science can measure is the light from exploding stars that could have taken no more than 6,000 to be seen on Earth, if God's word is true that is. So Dankward, its you or God. I will stick with God.