Data sources?

[vavroom]

I'm very curious to know where the statistics came from. 14% of people perceiving themselves as having a disability is clearly from census data.

But 38% of people with invisible disabilities and 50% of people with age-related disabilities are pretty strong statements to make, and without citing a source, or explaning a method to arrive at these numbers, it will be very difficult for a lot of people to trust these numbers.