What Actually Defines a Twink?

What actually defines a twink can vary as far and wide as to what attracts one person to another. I find Prince Harry extremely attractive, but I'm sure others would disagree with me. And that's normal, because there are no rules for attraction.

You'd think that it would be simple to define a twink, but it's not always like that. For instance, one night last summer I was with a group of guys and we were arguing about when "twinkdom" ends. I think you've ended you're twink years at twenty...