code: func (s *FilesystemStore) MaxAge(age int) {
  	s.Options.MaxAge = age
  
  	// Set the maxAge for each securecookie instance.
  	for _, codec := range s.Codecs {
  		if sc, ok := codec.(*securecookie.SecureCookie); ok {
  			sc.MaxAge(age)
  		}
  	}
  }
docs: // MaxAge sets the maximum age for the store and the underlying cookie
  // implementation. Individual sessions can be deleted by setting Options.MaxAge
  // = -1 for that session.