Don't put all your trust in Social Security. While it's a good bet that Social Security will continue to work for the next 20 or so years, some data suggest that if Congress doesn't radically alter the system — either by raising taxes or reducing benefits — Social Security won't be available in its current form. It is probable, however, that Congress will act to "fix" Social Security. In any event, Social Security was never designed to be the only resource for retirees in their later years. That makes it all the more important that you save and invest for the future. 
Have an extra room in the house? Try renting it out on Airbnb.com. According to Smart Asset, you can pay up to 81% of your rent by listing one room in a two-bedroom home. If you're really looking to ring in the cash, renting out a private home or apartment is the way to go. According to Smart Asset's findings, rates for full apartments are significantly higher than those for just rooms, with annual profits ranging from $15,000 to $31,000 for a two-bedroom apartment.
If you don’t live in a bottle deposit state, you can still cash in on recyclables by selling scrap metal. You may not have enough soda or beer cans lying around to make this worthwhile — and steel prices are so low right now, it’s not really worth the bother to go collecting them. But if you do have a lot of aluminum cans on hand, or if you have any scrap metal with copper in it, find a local recycling center and see what you’ll get (prices vary wildly by market). Still, unless you have a lot of copper pipes lying around the garage, or bags and bags and bags of old soda cans, realistically, we’re probably talking about getting $5 to $20 back.