If you are over 65 and collecting OAS, yes, any taxable capital gains is added to your income in a certain section of your income tax return. It forms part of the "net income" which is the test for OAS clawback. I think that is what is being referred to in the previous post.
The deduction for the capital losses carried forward from previous years comes "below" the "net income" line, so you still get the deduction. It just does NOT help the issue if you have Old Age Security claw back.
Steve, you mean, of course above, that you "pulled forward" some capital losses to 2013.
Jimbo444