I don't remember if he ever had any fight in light-heavyweight category before, but I expect him to move slower than before.
Remember what happened with Adesanya when he tried to move from middleweight to light-heavyweight, it can be only worse for Romero but let's see.
He looks good in latest interviews and he said that age is just a number, maybe because he is 44 years now.
Yoel Romero is having a really huge frame and no one could understand how he was able to cut down to 185 pound division and now he might be in his natural weight division without much weight cut that will make him stronger. Adesanya was not having a big frame and he is not a wrestler and once you face someone with a weight advantage on you it is difficult to get out of wrestling positions.