Questions on RDSP

Hi all, a couple of years ago my wife's doctor just did the paper work to get my wife eligible for the DTC - disability tax credit. She has type 1 diabetes and some other health issues. Was on ODSP but got complete cut off all benefits once my income started surpassing around 65k.

I'm currently earning around $100k and we are both 49 years old. Contributions are matched up to $1000 per year by government grants and contributions can be made up until the end of the calendar year in which the beneficiary turns 59.

That's the part that I think I understand. What I am trying to find out is if we have been accruing matchable contribution room since she became eligible for the DTC or does it only start once you open the account?