Old windows and doors are more likely to not be able to stand up to severe weather events, which might mean a serious amount of money to you when it comes time to make repairs and replacements. Damaging weather events are impossible to predict, but if you live in an area prone to these sorts of inclement weather, you are tempting fate keeping older windows in place.
Many prospective home buyers in 2017 expect your home to have up-to-date energy efficient doors and windows before even considering purchasing it. The mere fact that you have old, out of date windows may mean that people will either offer you less than what your home is really worth, or discount your house entirely until you have new, modern, more energy efficient and robust windows.
Your windows might be costing you more money, both now and in the future, than you realize. If you are wondering how you can go about increasing the value of your home, cutting down on energy costs, and making your home all around more secure, keep in mind the above considerations when it comes to your windows and doors.