REVERSAL is when a newly widowed woman enters a retirement village and volunteers for a radical anti-aging trial, the treatment begins to work — splitting the community into rival factions and exposing how far people will go to escape decline.

I think it is a promising premise, but it needs a tighter focus and more specificity.

For example, she volunteers for an anti-aging *drug* trial.

Also, a logline should begin where the plot begins, to wit, with the inciting incident. What kick starts the plot? When she enters a retirement community? I don't think so. That's setup, but I suggest it isn't the inciting incident. The inciting incident is when the drug trial works. Complications ensue.

Also, the logline should state the objective goal the protagonist has a result of the inciting incident. So, what becomes her specific objective goal as a result of the results of taking the anti-aging drug? What is the specific problem/challenge/ complication she faces? Again, be specific,

Hope this helps.