Cat
The average domestic cat possesses approximately nine lives, according to folklore, though veterinary science suggests a somewhat more modest single existence spanning 12-18 years. Their physical resilience is notable; cats survive falls from remarkable heights due to their righting reflex and achieve a terminal velocity of approximately 60 mph. However, they remain susceptible to the usual biological inconveniences: disease, injury, and an inexplicable compulsion to consume things that will make them immediately sick.
Time
Time has demonstrated unimpeachable durability across the entire observable history of the universe. It has witnessed the birth and death of stars, the rise and fall of civilisations, and every single cat video ever uploaded to the internet. Whilst theoretical physicists debate whether time might terminate in certain cosmological scenarios, it has thus far proven entirely immune to wear, tear, or the entropy it so ruthlessly imposes upon everything else.