We estimate that there are 400 inmates in federal prisons and 600 in provincial institutions aged 65 and over. How many children aged 18 or under do they have? We don't know and have no way of determining that.
It's important to recognize that the purpose of the Old Age Security Program is to support, not children, but seniors. The Old Age Security Program is intended to support seniors and provide them with an immediate and minimum standard of living.