funny you mention this - mine is at 5.1 with the highest it "can" be 5.0
I went to the GP and insisted I have blood tests done as it had been more than 12months since last time. So all came back fine apart from cholesterol.
Now baring in mind I'm 26 and never ever had any problems this is a bit worrying (for me). You know what drops your cholesterol fast? SARDINES!!! but not from a can
buy them fresh and just pan fry them with water - NO OIL!! add a bit of lemon just for taste. This saved my granddad many many times.
Interesting fact was that the GP told me if I had done those tests last year they wouldn't have said anything as the "target" was to get everyone below 5......apparently this year target is 4
go figure