@Alizz,
It's kind of weird that you're asking some random strangers with absolute zero professional fighting experience, let alone anyone here faking a claim to that effect.
Quote:can [you] fight for up to 20 years professionally[?]
Maybe? But then again? I have no idea about what ever applicable league rules say to this fact. Or what your personal medical and fitness history is.
Do you even have a local fighting league to research these questions? Maybe go in and ask other professional athletes in your related martial arts field?