“...researchers must also address the safety of a live attenuated vaccine in an older population.”
The mRNA vaccines pose no such safety risk.
[Note: US government created material generally isn’t subject to copyright, so posting excerpts saves readers time.]
“No safety risk” is a very brash statement, particularly with limited data.
The issue with the elderly is that their frail systems can be hurt by any tinkering...
Personally I wouldn’t get near any of these vaccines—I have much more faith in my own immune system.