Perhaps because young and not so young don't have an excess of capital to begin with?  A number of foreign purchasers work in a part of the world where their incomes how ever derived are not subject to the same levels of taxations.

As suggested by another contributor to the forum, our highest wage earners are taxed at approx 54% by provincial and federal agencies.  Hard to accumulate any sort of down payment when you keep less than half of your earnings especially considering those you are competing with for a house or home or investment keep the majority of what they earn.