MINIMALISTC

It's not age but skill level, it goes from 0 to 30 I think

I think it's a joke because she thinks it's just a little bigger.

modify might have been the wrong word, when he awakened his bloodlines, it gets better, I think. That being said, it was said further down that he created an artifact to hide the grandparents from the sacred grounds.

when he modified their DNA, he removed

she was with Shanks looking for the gomu gomu no mi

no

the system is a demonic voice if I'm not mistaken

how would she force reincarnation on him? doesn't he have 3 heroes with him? is he not much stronger than all of them? after all she is in a group with the ice empress and he must have a similar power with him, no? if you don't have an answer to these questions, we can consider your logic invalid I think.

yes

I believe he calls them Sacred Gears so as not to confuse the story with different names for each new invention