I truly believe it's because he's a man of integrity and character. Such people don't have to lie constantly, they don't care about their standings in the polls. Such people live lives of true virtue. Is Trump perfect? Absolutely not. He's made his mistakes. But he's apparently owned up to them and come out better for it. He LOOKS the part.
Contrast that to Biden, and liberals in general. How pale and sickly and dour they look. Those are people who are constantly having to try to con everybody. That kind of stress wears a person down, it reflects in their faces and posture. You don't see that in Trump.
If he is elected in November, he'll still look just as good in January 2029.
He’s our Energizer Bunny...the rest of us are worn out but not him...