How have the opinions about the Universe's age changed in last 20 years?
See details below
Following Lamaitre's Theory, the age of universe is depending of the moment of BigBang (Gamov made a fine tunning of this theory)
By other hand, Hubble's theory give a formula to evaluate the age of universe by
If we take a Galaxy at 1 megaparsec =
Nowadays, the trend is go down the Hubble constant and then, the age of univers is growing in the same proportion