I'm just using the common definition, as applied to personal/romantic/sexual relationships. I even linked a video that quite clearly explains the definition.

Ok, the video doesn’t seem to cover whether children can give consent, and you said they can’t, so what’s missing?

The legal system that decides when we can give consent (when we become adults, the age of majority) and when we can't (legal incompetence ruled by a court of law).

But you just accept the legal system? What’s the basis? What if it gig work was outlawed?