Pacquiao proved that age was not a factor when he defeated Broner and Thurman last 2019, at the age of 40. So Donaire can still do it as he is only 38 years old this year. So it is all about experience, training that will majorly influence their fight inside the ring. If Donaire will emerge as winner, who knows, he may face Inoue again.
Donaire is still good at 38 years, there's no trace of his age when he fought Nordine Oubaali he is very fast and very accurate if he can still show that deadly form in this kind of fight, Graballo is in big trouble they have the same style like Nordine Oubaali, I still consider Donaire a heavy favorite if he can still show that deadly form he showed in his last fight.
He will be the heavy favorite for sure, he is the current champion and I think he will continue to hold that belt and will get a big fight before he will officially retire. There's nothing to prove anymore as he has become already as one of the best fighters in the Philippines, but just like Manny Pacman, he continues to make easy money while he can still fight.