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.
1 For example, Summit Racing Equipment sells complete air conditioning kits for classic cars and trucks for $1,150-$1,395 for just the parts; installation by an experienced technician can take 12-22 hours at about $50-$100 an hour, bringing total costs to install those kits to $1,750-$3,595.