NeverarGreat said:
Mace would have to be in his 30’s, and Obi-wan would need to be in his 50’s. This actually makes more sense than the continuity of the prequels, since we are supposed to believe that Obi-wan ages from 35 to 75 in the span of 19 years. If Obi-wan was aged appropriately, he could genuinely be a father figure to Anakin.

Good point. In Retrospect, I’m not sure why George didn’t just combine the Qui-gon and Obi-wan characters in the first place. We didn’t need to see Obi-wan as a padawan, and Obi-wan having a master that died didn’t add anything to the other movies. An aged up Obi-wan could have easily done what Qui-gon did in The Phantom Menace.