According to the Buddha old age, sickness and death are suffering.
But to assume that is automatic and everything ends with our death seems to me to make the eightfold noble path redundant and we simply await or even hasten death in order to end our suffering.
I repeat, the four noble truths are about the liberation from samsara, which means cyclical rebirth.
When we rid ourselves from clinging, attachment and self-identification it will accomplish this goal - it will not prevent us from suffering sickness, old age or death in this lifetime - there are no such beings walking on two legs on his earth who have achieved this (even the Dalai Lama gets sick and suffers due to this).