Researchers have estimated the age of the Universe using a sample of 247,103 Milky Way stars from LAMOST DR7 and Gaia e DR3 parallaxes. Stellar ages were calculated using YY isochrones, requiring old stars to be metal-poor and $\alpha$-enriched, and ensuring consistency with FLAME-based ages from Gaia data.

The final sample of 155,600 stars within 5 kpc yielded consistent cosmic age estimates. Using an MCMC reconstruction of the latent age distribution, the oldest star was found to be $A_star = 13.73^{+0.18}_{-0.15}$ Gyr old. Adjusting quality cuts resulted in age estimates ranging from $13.31$ to $14.02$ Gyr.

This inferred age aligns with the 13.6 Gyr expected in CMB-calibrated $\Lambda$CDM, assuming early star formation. This agreement challenges solutions to the Hubble tension that rely on new physics before recombination, which typically suggest a cosmic age of $12.9 pm 0.2$ Gyr. Stellar modeling uncertainties, particularly concerning the low metallicities of the oldest stars and asteroseismic constraints, make it difficult to reconcile such a lower age with these findings.