I'm sixty this year and quite a few of my school friends, work mates and family haven't made it this far.
20% of those making 50 dont make 60 ( years of age)
as I was assured when I had ca colon at 47 - so a five year mortality of 50% didnt look that bad. ( now 71)
death rate of 100% is a bit AB - a rate is a number ( here of deaths) over a time ( month, monf, year decade)
and so that brings us to....standardised mortality ratio - SMR - 1.0 means you are dying at the same rate ( per unit time - usually year) as the normal population (*).
Oh death, where is they sting? where is thy vicgtory
(*) and so you can, as cured, die from Ca colon as there will be cases in the normal reference population. very very technical. un-mimsy and cerebral. and as ever sozza to the AB slow readers)