"Behind on the times"??? Ugh I hate when Americans do this. Since when did American morality become the standard for the world? Since when did having other cultures become being "behind on the times"? The American AoC is just as arbitrary as countries with lower ages, the human brain fully develops at 25 so until you raise it I don't see how a country having consent laws at 16 is wrong.
Heres a map of age of consent in Europe, America is an outlier even in the developed world. I'll be honest I support a high AoC but thats my individual moral opinion and other people and other cultures are something that I don't have the authority to dictate. 
