code: @Nonnull
    public CacheControlBuilder setMaxAgeSeconds (@Nonnegative final long nSeconds)
    {
      ValueEnforcer.isGE0 (nSeconds, "Seconds");
      m_aMaxAgeSeconds = Long.valueOf (nSeconds);
      return this;
    }
docs: Set the maximum age in seconds relative to the request time. Specifies the
  maximum amount of time that a representation will be considered fresh.
  Similar to Expires, this directive is relative to the time of the request,
  rather than absolute. [seconds] is the number of seconds from the time of
  the request you wish the representation to be fresh for.
  
  @param nSeconds
  Seconds to keep it
  @return this