You misunderstand, I was using age to talk about his potential to become even stronger than he was. i.e if minato hadn't died and was alive now he would be stronger/more experienced than he was at his time of death.
Tobirama and Hiruzen may not have sage mode but look at their jutsu arsenal. Hiruzen knows all of konohas jutsu and Tobirama invented half of them

. Not knocking minato, it would be a very close call between any of them in a fight ( not including hashirama ofc, completley different tier and could probably take them all on ).