I ask because I've found out about this what I think would be quite late in life. I'm 22 and for a long time I was too stubborn to ask for any support with my life, even though I was unhappy, because I blamed myself for self-pitying rather than thinking I might not be NT. My rationale was actually "If I had Asperger's, surely someone would have noticed by now?" But what really happened is that I should have spoken to someone much earlier, as the counsellor I saw suggested I might have it during our first meeting.
So I'm wondering if this is fairly typical, or as I had previously thought, are most people diagnosed at a younger age? Did you ever consider the idea but delay finding out?