It's b/c he has great facial bone structure. His high cheekbones help hold his skin up (when people age, their skin loses collagen and elasticity so we tend to get more blob-like but people with more defined bone structure basically "hold their shape better.") He won the genetics lottery, that boy!

But I also think it depends on how he dresses himself up (am I using the correct term here?). I mean if he wears his hair down, or gets himself clean-shaven then I can certainly say he looks at most 10 years younger then he actually is. But with that scruffy look and buzz cut, like what we see in "The Best of Me", he looks exactly his age.
What does it matter what anybody thinks? Most people don't think.

I keep seeing that trailer for his new movie.
while he is very fit and looks good and healthy. I would not guess him 27.
41 is not OLD AGE haha he looks. to me. his Mid to late 30's
but that's hardly old! 41 shouldn't look old yet. there is people his age and younger who look worn and or bald and fat. partly genetic and partly life style.

I was coming to say the same thing, in other words. He is the same "boy" he was on Ally McBeal. He hasn't aged a day!

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I am not saying he looks 20,but James does have a youthful look,he does not look 40 imo,he looks 30 something. He is fit too.
In a time of ancient Gods, Warlords and Kings, a land in turmoil cried out for a hero The power the passion the danger

Some people just age good.

Because hes Cyclops