code: func (c *Client) EventsOlderThanAge(age int64) ([]contract.Event, error) {
  	expireDate := db.MakeTimestamp() - age
  
  	return c.EventsByCreationTime(0, expireDate, 0)
  }
docs: // Remove all the events that are older than the given age
  // Return the number of events removed
  //RemoveEventByAge(age int64) (int, error)
  // Get events that are older than a age