I think Thor and Vision are also not supposed to age and nobody's complaining. Same goes for Superman. But add a woman to the rooster and there's a 'oh my! She's 30? How can she be alive and well in 8 years time?'...
Wonder Woman fighting age bias, that's new.
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Anyhow - loved the movie, despite it's flaws.
The final act was too CGIed for my taste, the whole Diana vs Ares fight looked completely artificial. The background of ever burning flames was just there (so they didn't have to render the airport?) but at least it was bright. I found some parts of the movie too dark - in colors department. I know it's DC's thing, but when you can't properly see if the characters are kissing or hugging, it's not a good lighting job.
The concept of space and distances was also crooked, as some of you pointed out in the thread. The Turkey > Themiscyra > London trip took way to short, especially when juxtaposed to what was happening in the villains camp. I also have some issues with Themiscyra timeline and the question how long was Diana a child?... The narrative makes me believe Diana was barely in her adult years when Steve crashed by the island, but that would mean Hippolyta sculptured her out of clay 20 years prior... And Zeus was long dead by that time. Right?
Themiscyra is an island where time doesn't take effect that much, so all the Amazons can be frozen in time, but was Diana a child for a longer period?
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Still, I'm nitpicking. I really loved the movie, I loved Diana and her wonder at the world and the dread of realization that nothing is as easy as in the stories.
To my surprise, I loved Steve, for the first time ever. I loved the band of misfits he called for and how not everything was a cliche there (the marksman did not fire a war-turning shot, for example). I loved Etta, for the little time we had her (wished we had more :) ).
But what I loved most about the movie was the respect it gave to both women and men.
Before this, i had to watch strong women being objectified (Harley Quinn in Suicide Squad), victimised (Black Widow kidnapped in the Age of Ultron) or relegated to sidelines, their stories left on the cutting room floor (Lois in BvS), while the men were heroes. But I didn't want a simple turn of the tables, with men helpless and women heroic. That's not the point.
The WW movie shows me that it's possible to have a heroic woman and a heroic man at the same time on screen, without making one ridiculous and propping the other. Diana is a hero and Steve is a hero in their own right. He doesn't need to be stupid for her to be competent. She can be naive but still strong. He can pick her up from tarmac and she can fish him out of the sea. It's complimentary, even if she could easily juggle a tank.
Now imagine Marvel doing that. Hopefully in the future.