New research puts age of universe at 26.7 billion years, nearly twice as old as previously believed::Our universe could be twice as old as current estimates, according to a new study that challenges the dominant cosmological model and sheds new light on the so-called “impossible early galaxy problem.”
Yeah, you’re right. I guess it’s 5 times slower relative to how we perceive now, so it’s definitely not a constant.
https://phys.org/news/2023-06-quasar-clocks-universe-slower-big.html