Scientists claim stalactites and stalagmites take many thousands of years to form. This stalactite is in the Rolphton Hydro Electric near Ottawa, Canada. It was built in the 1950’s. It formed on the top of a pipe in less than 50 years!
Examples such as these show that long periods of time are not necessary, only the right conditions. Many are old but it is not necessary as not all are. Claims for millions and billions of years for the age of the earth are simply that, claims; they lack real evidence, just as claims that stalactites are thousands of years old.