depends on you, my cats sleep freely in the flower room (love it) nibble the leaves bit, but not much, its been 2 years.
my pots are too small for them to piss in lol.
course when they were younger i had to keep an eye out and yell at them if they were treating it disrespectfully, no touching the small plants and only nibbling each plant bit (which they do, just sniff the small ones (they did eat a small one 2 years back or bit of it, but we had a talk)
i doubt older cats would be much of a problem, but like i said , depends on you.
the only real downside is that cats hairs stick in buds bit, but its not an overwhelming problem and the cats just love it in there (its like sleeping in the sunlight and cats originally come from africa, they dont mind water so much for example in southern countries (or are more easy about swimming anyway)they mostly hate water so much becuase they get so cold afterwards.)