A bit of perspective:
"The National Survey of Sexual Attitudes and Lifestyles, which interviewed nearly 19,000 men and women in 1990-91, is the most comprehensive sex research ever conducted in Britain. It found that half of those questioned - which included both gay and straight - had their first sexual experience (not necessarily intercourse) before the age of 16, mostly after the age of l4."
Personally, I don't think the age of consent needs to be changed. Plenty of kids smoke, but just because they DO, don't mean that we should condone it.
Another point - I personally think that Peter Tatchell is a hero for a number of reasons, but I think he's wrong about this. And let's not assume that he necessarily speaks on behalf of the gay community on every subject. That would be like assuming that Noel Gallagher speaks on behalf of all guitarists, just because he plays one.