code: public void setMaxConnectionAge(long maxConnectionAge, TimeUnit timeUnit) {
  		this.maxConnectionAgeInSeconds = TimeUnit.SECONDS.convert(maxConnectionAge, timeUnit);
  	}
docs: Sets the maxConnectionAge. Any connections older than this setting will be closed
  off whether it is idle or not. Connections currently in use will not be affected until they
  are returned to the pool.
  
  @param maxConnectionAge the maxConnectionAge to set.
  @param timeUnit the unit of the maxConnectionAge argument.