I’m 45, single, earn $65K/year and have never owned a home. But I hear 40-year mortgages are all the rage — should I take one out and finally get onto America’s housing ladder?

Bryant's proposed loans have no age limits, so it could be an option for middle-aged Americans in their 40s who have never owned a home. The big question, though, is whether these longer loan terms would be a good option or whether taking this approach could cause more problems than it solves.

Are 40-year mortgage loans available?

If you're thinking a 40-year loan could make a house affordable for you, the first thing to know is that Bryant's proposal is currently just a suggestion, not a reality. The majority of mortgage lenders don’t offer 40-year loans out the gate — and if they do, it’s more of a modified solution to those struggling with a 30-year loan.

Right now, 40-year loans aren't considered conventional or conforming loans, which means they don’t fit within the guidelines set by the government sponsored enterprises that guarantee most mortgages in the U.S. That makes them too risky for traditional lenders to take on.

You're likely to find 40-year loans only from a small minority of specialty lenders, small banks or credit unions. In many cases, these loans contain risky features, such as interest-only payment periods and balloon payments (a large, one-time payment once the mortgage is due). Having few lenders to choose from also means these loans are often expensive — and opting for a loan with an unconventional payment structure can increase your risk of foreclosure.

Unfortunately, as anyone who lived through the 2008 financial crisis knows, when lenders start making unconventional loans to help people buy homes who couldn't afford to do so using more traditional methods, the story often doesn't end well.

Would taking out a 40-year mortgage be a good idea?

While 40-year loans currently aren't a good option, could they be if Bryant's plan came to fruition and more lenders started offering them at favorable rates?

Sadly, even in this situation, you might not want to commit to being in debt for four decades — especially if you're older.

One of the biggest benefits of buying your own home is that when you pay off your mortgage, your housing costs decline. Ideally, this enables you to become debt-free in retirement. If you take a 40-year loan, you'll probably lose that benefit.

Plus, stretching your loan out to 40 years is going to mean paying a lot of extra interest over time. You'd likely be better off buying a cheaper home with a 30-year loan.

Now, there may be a case for a 40-year loan if you take one out at a young age, if the interest really is subsidized or if you use this loan to get on the property ladder but refinance or make extra payments ASAP so you can become debt-free more quickly.

Before you’d even consider moving forward, though, you'd need to understand the total costs and take the time to do the math and decide if it was right for you.