In 3 years when I'll be 39.
We could do it sooner but we're on a fixed rate and the early repayment charges are about the same as the interest we'd save, so it's not worth it. We'd rather have the cash readily available for emergencies.
It's tempting to move to a bigger house but we've always tried to have plenty of buffer between income and outgoings, which I'm very glad of at the moment with cost of living increases.
Our pensions have been neglected though, that's the next focus.