There is good evidence for the current estimate. If there is better evidence for a different age then opinion will move. It doesn't work off hunches.
Unless you have a box of dark matter in the back of your closet?
If the only place you find evidence of DM/DE is a billion LY away, then what you are looking at isn't dark-whatever TM, it's an artifact that builds up over time and distance.
The goal posts keep moving as the telescope sees more and more....
It is time for the scientists to tell the truth, the whole truth, and nothing but the truth:
“We don’t know the answer.”