Thanks for the great replies! I never thought into future about the Bar repurcussions - it's very interesting. Personally, I do not think that any illness is their business (hope I don't open a can of worms here). Something that I forgot to add - this statement will only be used as a PS at one school. I have another PS which discusses my human rights activities in another country- it's a very strong PS. However, this ADHD/OCD statement will be used as either an LSAT Addendum or Disadvantage Statement. Sorry to confuse.
As my LSAT scores stink and my GPA from undergrad has no great trends (2.88), I think that mentioning the OCD might just give them another good reason to say, "NO". It would take too many words to counter the stigma and misinformation surrounding OCD. I'm going with "ADHD w/related anxiety issues" (or something like that).
As far as older applicants- there is a misconception that adcomms focus on our experiences and not undergraduate work. I talked to some of the deans from last year's applications- and they seemed very focused on the undergraduate work from over 15 years ago! I was shocked! I came out of last year's application cycle feeling that older applicants are held to the same standards as applicants fresh out of college. Remember- time doesn't (seem to) heal anything with the adcoms!
Lastly, as I live in a foreign country, my psychiatric records probably would not make it to the States. However, he will be sending a letter to the LSAC to get me another chance for the LSAT (combined with a letter from an assistant dean), because I attempted the LSAT three times in two years. With these new meds, I think I can do much better. However, I am only asking for another chance at the LSAT (under the same testing conditions as everyone else).
Again, thanks everyone- you guys are great!