"Because they're too physically fit."
"Yes, they are too physically fit, that's why you can't beat them. But what about when they put on armor?"
"When they put on armor, they're still very strong. They can withstand a greater load due to their physical fitness, and they can execute more difficult maneuvers. They aren't afraid when mechas collide, whereas we might faint."
"Is that what you all think?"
"Yeah, what else could it be?"
"Then think back, when I fought with you guys, did any of you manage to hit me? Were your difficult combat moves effective against me?"
"Can it be the same? You're more experienced than us."
"But in reality, if it's just a matter of physical fitness, I'm actually not as good as you young people."
"But your explosive power is stronger than ours, your response speed is faster, and your combat instincts are sharper. You don't seem like an old man at all."