NV, I held the same view as you concerning the age of the earth at one time. (I took a lot of geology) It now seems to me that a young earth is just as probable. There is no way to prove either.
Where did you study geology?
Mt St. Helens eruption in 1980 showed us how things that look really old can happen in days. The carved canyons with the super heated ash/snow mud carving through rocks, the hydrological sorting that layers sediments. If we had never seen it happen geologists would have looked at these layers and said “millions of years” to carve these canyons.