I note from the space.com report, "...Basically, settling Hubble tension once and for all is dependent on resolving the true value of the Hubble constant, which is a crucial number in calculating the universe's expansion rate. Yet, for whatever reason, our theoretical predictions of the constant do not appear to match up with reality. According to most models, the Hubble constant should equal something around 68 kilometers per second per megaparsec (km/s/Mpc). One megaparsec is 1,000 parsecs, or about 3,260 light-years, for context. But after scanning stars and galaxies across our universe, some experts calculate the constant to be 69.8 km/s/Mpc, while others find it to be as high as 74 km/s/Mpc, depending on the method of measurement. Still others have suggested solutions that fall between the two."..."Webb measurements provide the strongest evidence yet that systematic errors in Hubble’s Cepheid photometry do not play a significant role in the present Hubble tension,"
The reference report and paper provided, Crowded No More: The Accuracy of the Hubble Constant Tested with High Resolution Observations of Cepheids by JWST,
https://arxiv.org/abs/2307.15806, 28-July-2023.
My note, from the 20-page PDF report. "The most significant differences are seen between measurements of local Type Ia supernovae (SNe Ia) calibrated by Cepheid variables, which yield H0 = 73.0 ± 1.0 km s^−1 Mpc^−1 (Riess et al. 2022, hereafter R22), and the analysis of Planck observations of the Cosmic Microwave Background (Planck Collaboration et al. 2020), which predict H0 = 67.4±0.5 km s^−1 Mpc^−1 in conjunction with ΛCDM.",
https://arxiv.org/pdf/2307.15806.pdf
My note using Ned Wright cosmology calculator, the universe age is 12.906 Gyr using H0 = 74 km/s/Mpc.
https://lambda.gsfc.nasa.gov/toolbox/calculators.html. Using
https://www.kempner.net/cosmic.php, the universe age = 12.5292 Gyr. The Hubble tension using different values for H0 results in some bouncing ages for the Universe in BB cosmology
Another recent report showed 76.9 km/s/Mpc for H0. Billion-light-year-wide 'bubble of galaxies' discovered,
https://phys.org/news/2023-09-billion-light-year-wide-galaxies.html
My note. H0=76.9 km/s/Mpc is a much higher value than 67 or 68 km/s/Mpc. Using Ned Wright calculator, H0=76.9 km/s/Mpc and z=0, "It is now 12.420 Gyr since the Big Bang. The age at redshift z was 12.420 Gyr." The universe age shrinks to less than 12.5E+9 years old
Using this calculator,
https://www.kempner.net/cosmic.php, z=0.068 and H0 = 76.9 km/s/Mpc, "age of the Universe at z = 11.2337 Gyr.
In my home database for 2023, I see 10 reports that present H0 ranging from 66.6 km/s/Mpc (
https://forums.space.com/threads/ho...supernova-data-could-help-nail-it-down.61362/) up to 85.3 km/s/Mpc, How fast is the universe expanding? New supernova data could help nail it down,
https://arxiv.org/abs/2305.07022
I find it interesting to keep track of these H0 reports and the bouncing age for the Universe presented
Edit. Using kempner calculator and H0 = 76.9 km/s/Mpc and z=0, the Universe age =
age of the Universe at z | = 12.0567 Gyr |