I’d be guessing so check with CRA.
The front line call center CRA people will probably say the age is a hard limit.
I don’t how to check with someone from the CRA that would know.
The best advice is to get the free consult from a lawyer and post the answer here. 
David has said that his firm doesn’t have much experience with DTC so probably better to go straight to the government.
Thank you for your messages. I’ll see what I can find out and will post update when I have some additional information to share.
Unfortunately, no bonds or grants can be paid after age 49 under any circumstances. Had you opened the RDSP at age 49, you could have retroactively been eligible for grants and bonds (up to a max of $10,500 a year), but at 50 you are not eligible for anything.
The reason for this is because of the 10 year clawback rule and the age of 60. If you contributed money at, say, age 51, then at age 60 you would lose that grant money because of the clawback.
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Or they COULD act as if it was contributed in the year it was for.
But they don’t so oh well.
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Thank you for the explanation.
You need your health care provider to recommend an indefinite expiry date and write that your disability is permanent.