The link that I gave is that of the Office of Dietary Supplements - they are the department authorised by the US government to research and recommend RDAs for various aspects of our diet.
As such they have little in the way of vested interests.
Their recommendation is that a woman aged 62 should have 1200mg calcium.
Their recommendation is that a woman aged 62 should have 320mg magnesium.
http://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/
What RDAs are you aiming for and what authority suggested your RDAs?
I have to say that I would have difficulty hitting my targets for calcium with leafy green vegetables.
10 cups of lettuce gives
38.5mg magnesium and 99mg calcium
10 cups of spinach gives
237mg magnesium and 297mg calcium
Having both would be a particularly high amount of leafy salad and would take you well on your way to hitting a likely magnesium target...
It would however leave quite a lot of calcium to be gained from almond milk or the other things that you eat / drink.
You mention that your almond milk is home made.
What is the calcium content of 1 litre of almond milk made by your recipe?
While some people are sure to suffer because they are magnesium deficient - it does not follow that a diet that is magnesium sufficient is automatically calcium sufficient.
I can easily understand a decision to avoid dairy if you feel that you have a medical condition which makes it inappropriate. This does not however mean that a supplement may not round off your intake to hit these targets.
We all prefer to hit targets with nutrition alone - but supplements can help when we face a shortfall.