The worst thing young adults can do is go to graduate school because they aren't sure what else to do or they can't find jobs. Grad school, after all, is often an extremely long commitment. A Ph.D., for example, can take six years.
The average lifespan for an air conditioner is 10 to 15 years. Some air conditioners last up to 20 years. As interesting as these data points may be, they don't tell you the whole story. The issue is that a variety of factors affect the lifespan of an air conditioner.
After thawing the coils, the air conditioner may take a long time to cool the living space again. Once the space reaches the temperature you set on the thermostat, the central air unit should automatically shut down until temperatures rise enough to warrant the air conditioner to cycle again.