I'm not a nurse, but I definitely wouldn't assume you were autistic based on being able to accept a terminal diagnosis. That isn't in itself a sign of autism. There are many reasons you might be accepting, from religious beliefs if you have any to being in shock to just being very mentally healthy and resilient.
In any case, it is a good thing.
Signs of autism include having sensory difficulties, such as being unable to eat certain foods or wear certain clothes or being unable to concentrate in loud, busy environments, taking things very literally, such as idioms or rules, not always "getting" social rules that seem obvious to others, having "splinter skills," like having far greater differences between what you are good at and what you are bad at than most people, liking routine, clumsiness, stomach problems, fidgeting a lot...
Autistic people can react very differently to NTs to major events, either being more or less upset, but being more or less upset about one thing doesn't in itself indicate you are more likely to be autistic.
You not feeling angry or resentful about your terminal diagnosis doesn't necessarily mean you are 'on the spectrum'. People respond to the thought of death in very different ways and there isn't a single right or normal reaction. While some people feel all sorts of emotions,others like you may feel a sense of calm acceptance, especially at an older age when they've lived a full life. Acceptance can come from many places, wisdom gathered over the years, faith, a practical outlook, or simply tiredness with the struggles of every day life. It doesn't mean you are lacking in something. It may just mean that you are at peace with the natural order of things.
Autism or being 'on the spectrum' is about life long patterns in how a person thinks, communicates, and relates to others. It isn't defined by how someone reacts to illness or dying.
I hope this has been of some use. Give us a ring if you would like to talk anything over. The number to call is Freephone 0808 800 4040 and the lines are open from 9am till 5pm Monday to Friday.
