This happens because the temperature at which oxygen changes from a gas to a liquid is about 13 degrees Celsius above that of nitrogen. The oxygen can be seen dripping from the can just as on a humid day you can see drops of water condense and drip from a can you take from the refrigerator.
Though you technically can join the military up to age 42, if you're 35 or over you'll need an age waiver if you've never been in the military before.
Answer by ks (99). 47 is too old to join the military. Under federal law, age 42 is the maximum age to join. However, those with prior service can receive a waiver based on their time in service. Every branch age limits: Army 42, Air Force 34, Navy 39 and Marines 28.