Some bad news if your cholesterol "normalises" on a LC diet. Before you contemplate avoiding old age, just consider that these people were on the SAD diet and high TC might not be needed if you eat LC/HF. Or perhaps your TC might rise with age the way mine seems to. Whichever, this was only a cross sectional study. The full text says very little the abstract doesn't. My favourite line from the abstract:
"In contrast to our expectations, high total cholesterol and high LDL cholesterol were associated with higher memory scores for noncarriers of the APOE4 allele" [Comment: that's most of us]
APOE4 is a bad news lipoprotein subtype gene for Alzheimers disease, you could say it fails to stop your brain rotting under the onslaught of the sugar content of the SAD.
Now if I could just remember where I left my kayak...