With more and more treatments for illnesses, those born with a weak
constitution, who in earlier days might have died young are now living
to a ripe old age.  My question is, and I don't know the answer, given
our medical knowledge today, and our ability to cheat death, are we
also cheating 'natural selection' (survival of the fittest), and
setting ourselves up for a future where almost everyone will have
congenital health problems?

With science and medicine having only been truly effective on a grand
scale in the past few generations, is this something that should be of
concern?

Regards,

Will Alber.