It of course would depend on the nature of the act in which the individual had engaged. If it was an act prohibited under the Criminal Code, yes, they would be included. If it was consensual sex, they would not. As you know, a consenting sexual act between someone aged 15 and someone aged 18 is not a prohibited act for which you can be convicted. Sixteen is the age of consent under the law now, but there is also a close-in-age exemption. So if there was a three-year difference between the individuals, there is an exemption for someone who is under that age.
On October 22nd, 2009. See this statement in context.