I think finding the 16 year old would be hard, but at the same time look at Harry Potter for an example.

I know from experience its really hard to get the Spiderman body at that age. However once you hit 20 or so its really easy to start putting on weight.

I dont think this guy looks too old though, and he isn't too big either so there really isnt that big of an issue.

... but considering the sequels which will inevitably come, you'd need someone at least under 20. I'm sure it would have been possible to find a 18 year old guy with a little muscle-tone...

Problem with this Andrew Garfield guy is that he's already 28. He might be a great and convincing Parker right now, but you need to think ahead 5-6 years from now, when they'll be doing Spider-Man 3 and he's almost 35...

TBH though, I honestly feel they should go completely CGI with these kind of movies.

That way you can stay MUCH closer to the original vision, including spectacular effects plus character-design, plus it would be much cheaper, budget-wise, and allow for much more creative freedom.