It may be, in the sense that old people tend to have more physical ailments and incapacities to deal with, so if you've got ASD as well, you can get overwhelmed with too much crap to fix and not so many physical abilities to fix it with. OTOH, when you're old, you're not forced to work for an employer any more, and the world of work is a big source of trouble for a lot of Aspies, because the employer controls so much of your life, so if they don't give you the accommodations you need, your life can get pretty miserable.
All in all, I don't think my ASD is more of a problem to me than it's ever been, at least so far.