Hi all,
I don't buy many plants, so a lot of mine I bought once and have owned them ever since. I'll ignore plants that sucker like Cryptocoryne spp., Limnobium, Salvinia etc. because they are potentially immortal.
Out of the plants that form a discrete entity, I've owned the same individual of Echinodorus bleheri, Nymphaea lotus "Red", Bolbitis heudelotti, Anubias barteri and Microsorum pteropus since 2008.
cheers Darrel