DX - Read again what I posted. It excludes those youngsters who have the symptoms and those elders who have had them their entire lives. Further, as has been posted, the hypotensive episode occurs whether a person has ben cycling or not. It is brought on by a rapid change in posture.
By the way this doc is no quack. In fact he is very good. He does have a weakness in his geriatric training in that he has preconceived notions about what elders should and should not be able to do.