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The number you read is for dying within the next year. The OP said within a decade.

OP also said "in their 30s" not "at 30". So I'd use 35-45 rather than 30-40, which shifts it a bit.

Since I already have the spreadsheet built for my other comment:

30-39 is 2.1%

35-44 is 2.5%

40-49 is 3.3%

---------

30-49 is 5.3%

Ranges are inclusive of entire year. 30-39 is 30th bday to 40th bday