You're 54 so I assume you've been muddling through life reasonably well without therapy or special accommodations. So whether or not you get an assessment is likely a matter mostly of personal interest.
With no compelling reason for a formal diagnosis, some people would rather not get one. Others, like myself, did not need an assessment but got one anyways. I thought it was wonderful to finally know why my life had been strange.
My diagnosis is:
Autism Spectrum Disorder, Level 1 (Mild)
With an additional note that I also satisfy the criteria previously associated with Asperger's Syndrome.
I got my diagnosis shortly before my 65th birthday. I retired (comfortably!) when I was 56! I did not need the diagnosis but it was wonderful to finally know.
If you decide to pursue an assessment I recommend checking out your health insurance coverage. They might cover part of the cost.
When I decided to get an assessment I called my health insurance and asked about it. They were immediately interested in helping. But they did not know what they were talking about! I don't think they got many requests for adult autism assessments so they were unfamiliar with them. They gave me bad information that delayed things a few months.
It turns out what I needed was a licensed psychologist who worked with Autism and took patients my age.
The assessment is likely to cost $2k to $3k. In the confusion of dealing with my insurance company I strayed outside their network of providers and they planned to cover about half the cost. I suspect they would've covered more I had stayed inside their network of providers.
But, I was so happy with the assessment result I nearly chose not to request even partial insurance coverage.
I was very happy to understand the difficulties that I'd been hitting my whole life.
_________________
When diagnosed I bought champagne!
I finally knew why people were strange.