I have been Dyspraxic(a closely related condition) since birth though I was not diagnosed as such until the age of 33.
I did not enter further education until the age of 26,did not enter higher education until the age of 31 & did not enter postgraduate education until the age of 36.
The crucial thing though is that I did succeed at all of those levels.
I am now training as a SCUBA diver (a desire since childhood)
I still show all the symptoms listed above but no longer allow myself to be limited by them.
I would advise anybody in the same boat to know & acknowledge their own limitations but to be sure not to underestimate themselves either.
If you have ADHD or similar & wish to take a degree & believe yourself capable of doing so then go for it.