Should there be an attempt to unify the age of consent around the world? NSFW?

A report in the news in the UK today spoke about the lead singer of a band in the UK being arrested for suspected child sex offences. The child in question is reported as being 13 and clearly this is below the age of consent in the UK which is 16.

However, interestingly enough if he had travelled to Colombia or Panama then he would have been fine since the age of consent there is 12 for females, but for some reason 14 for boys, or even in Japan it is apparently 13.

The question, therefore, is should there be an attempt to unify the age of consent around the world or should pressure be put on countries where there is inequality in the age of consent between sexes or on those countries where it is 12 or even 13?

What age really is too young?