We don't have that figure either. We may have done the calculations as part of another query.
However, we can see that amounts for seniors' benefits will increase by almost $9 billion from 2021‑2022 to 2022‑2023, the year in which eligibility for those aged 75 and over was expanded or at least enhanced.
Given that, from a demographic point of view, a good proportion of Old Age Security beneficiaries are aged 65 to 75, we can assume that the cost would have been roughly the same, or perhaps even a little higher. However, I don't have those figures.