It's not impossible at all. I was cathertised very quickly and easily in an American hospital once. You simply roll the foreskin back; takes all of two seconds. Older men come in with infections because of poor hygeine? So what about older women? Should we circumcise girls at birth in order to make your job more convenient?
Maybe more effort should be spent on preventative health-care and education, rather than the ignorant and commercial way the US treats its patients. You live in one of the most unhealthy cultures on the planet and then you blame nature for your problems.
An older man should not have phimosis. This is a relatively easily treated condition and should be addressed in youth. Unfortunately many (if not most) doctors in the USA have no idea how to treat phimosis without circumcision, because there is a large deficiency of knowledge about penile anatomy and treatment in circumcising countries such as the USA.
Let us not forget that older men (and women) have been around for thousands of years, just like the operation we call circumcision. Why hasn't this procedure ever been advocated for health reasons prior to 20th century USA?