SMD means that the component is soldered on the surface of the board, as opposed to having wires that go through the board and are soldered on the other side. SMD things are typically smaller and require more experience and more precise tools to replace.

Capacitors do go bad with age, even if you don't use them. They go bad faster the more you use them and the higher the temperature. It also depends on the quality and type of capacitor. Electrolytic capacitors are prone (or even doomed) to failure and can be replaced with Tantalum capacitors, which don't typically ever fail - at least not that I've seen.

It is always unknown if/how an item can be repaired when something inside blows up like that, so if you can get it apart and take some photos, we can at least explain what could be done to possibly fix it, and maybe someone here will offer to repair it for you.