I accept the evidence we have for an old universe.
Some examples, non-exhaustive list:
Am I disagreeing with Holy Scripture? No. Even St. Augustine held the belief that the "days" of Genesis didn't refer to 24h periods.
‘All that exists outside God was, in its whole substance, produced out of nothing by God. (De fide.) (Vatican Council I, 1870)
Most of the Church Fathers held this was done in a literal six-day Creation until Saint Augustine proposed that all was created complete immediately but presented in Genesis by way of six-days to emphasise order in His creation. St Augustine had a problem with light. He believed light was caused by the sun whereas Genesis said God created light before the sun. Augustine solved this problem of his by saying that God must have created the sun and light and everything else together not over six days.
‘So then, although it is without any stretch of time being involved that God makes things, having ‘the power to act available to him whenever he will,’ (Wisdom of Solomon 12:18) all the same the time-bound natures made by him go through their temporal movements in time.’ --- Augustine, commentaries on Genesis.
St Basil, in his Hexaemeron, disagreed and explains why God created light before the sun:
‘However, the sun and the moon did not yet exist, in order that those who live in ignorance of God may not consider the sun as the origin and father of light, or as the maker of all that grows out of the earth. That is why there was a fourth day, and then God said: “Let there be lights in the firmament of the heaven.”’ (Hm. VI:2)
St Augustine was not aware that light is but an effect of electromagnetism. He must never have seen lightening duiring the darkness of night. If St Augustine were to come back and go see a football match under lights at night, he wouldn't believe it.
‘Day 1: In the beginning God created heaven, and earth. And the earth was void and empty, and darkness was upon the face of the deep; and the spirit of God moved over the waters. And God said: Be light made. And light was made. And God saw the light that it was good; and he divided the light from the darkness. And he called the light Day and the darkness Night; and there was evening and morning one day.
So God did create light before the sun. Anyway, Augustine's iimmediate creation, nor the six-day creation, did not allow any time for al old universe.