If you have a new liner with a leak will you get the same amount of years out of it had it not had a leak?

That would depend on several variables. If the leak is professionally repaired and there is no damage to the substrate under the liner, then you should be fine with the life expetency of the liner. If there was a wash-out under the liner, then there is added stress to the liner at that point which can shorten it's life expectancy. If the patch is done with a clear store-bought patch kit, the patch likely will not hold very long and the liner will likely begin leaking again, which can damage the substrate and affect the liner integrity.