Well, yeah, actually some people said it was a bad decision (back then and since then). OTOH, people did marry much younger back then. My favorite aunt married at 16 (and he was 18). They dated from the time she was 14. My mom married at 18 and dated my dad from the time she was 15 (he was 20 - they were married for over 60 years, very happily).
That being said, both that aunt AND my parents were shocked by Elvis's relationship with Priscilla. Too big an age gap for them. As a result, his music was banned in our household. My parents were disgusted that our next door neighbor was an Elvis fan and played his music, but stopped short of prohibiting me from playing over there. But for years, I was given the idea that Elvis was a horrible person (not just the age gap, but also the way he danced, ha). The pastor of our church talked about him from the pulpit, etc., saying he corrupted "a child."
Priscilla eventually came to think of it as a bad decision, herself, as indicated by every biography I've read of Elvis. I remember feeling sorry for him, as he pined away for her after she left him. Reading Priscilla's autobiography is eye-opening as well. At least they waited until she was 22 to marry. Whether her book is forthcoming with all details is certainly a matter of opinion, but I think they waited to consummate their relationship until she was much older than 13.
However, Celeste was only 11 when she ran away, as I understand it. Average age of onset of puberty has dropped since the 1950's, so I guess there's definitely a comparison to be made between Priscilla and Celeste.
It's my understanding that the average wait for full autopsy reports in L.A. County is several months. The number of cases they have is staggering and resources are thin. Four to six months for the toxicology:
https://me.lacounty.gov/faqs/#1525897683365-d8048457-c352
IMO