This paper presents a rough estimation of the cosmic age based on photon energy attenuation, rather than cosmic expansion models.Within the framework of the Light Universe Theory, cosmological redshift is interpreted as a gradual decrease in photon energy over time, instead of wavelength stretching due to spatial expansion. Using the observed energy of the cosmic microwave background (CMB) and assuming representative high-energy photons in the early Universe, the elapsed cosmic time is estimated from the energy attenuation ratio.This approach requires only observed photon energies and minimal assumptions about initial conditions, without relying on distance measurements, expansion history, or detailed matter-energy composition models. The resulting estimate suggests that the cosmic age lies in the range of approximately 11 to 20 billion years.The lower bound corresponds to conservative parameter choices, while the upper bound reflects uncertainties in initial photon energy and representative observational values. This work provides an alternative, model-light perspective on cosmic age estimation and highlights the potential of photon-based approaches as complementary tools to standard cosmological methods.
Akihito Sugawara (Sat,) studied this question.