Order-of-Magnitude Estimation of the Age of the Universe Based on the Light Cosmology Theory Using CMB Wavelength Stretching

This work presents an order-of-magnitude estimation of the age of the universe based on the light cosmology theory.Instead of relying on detailed cosmological models, the approach uses the observed wavelength stretching of photons from the early universe to the present cosmic microwave background (CMB) to approximate the universe's time scale.A proportionality coefficient kkk is defined as the ratio between the current CMB photon energy and the estimated initial photon energy, providing a reference for evaluating the effect of cosmic expansion on photon wavelengths.The estimated age of the universe is approximately 14 Gyr, consistent in order of magnitude with standard cosmological models.This framework offers an alternative, conceptually intuitive perspective on cosmic time scales, independent of detailed matter-energy composition or expansion history.