Hello Prakhong
I phoned with the AHV in Geneva today (June 3rd, 2014). I got the answers as follows:
In January 2014 you have confirmed your status concerning being alive and that you are still widowed.
They have received your infilled printed form.
Next time you'll get a similar form is in November 2014 (after age of 70, every half year)
With your pension everything is OK and no problems could be found.
I hope I could help you to your full satisfaction.
Looking forward to hearing from you, we send you and all of your families
Our best regards from Switzerland