I bought my grandparent's house (that they built when I was 10) from them so I am lucky enough to have many of their plants, including just a few that were transplanted from the house they bought in the 30's. In addition, I have a few from my great grandparents including an asparagus fern that is well over 70 years old (and older than I am) and a few peonies that are even older. Sadly, each year I lose one or two of these heritage plants to bad weather, bugs or whatever....
I keep adding my own plants but I will be the last one in the family here...my only son married an Aussie girl and is now an Australian citizen (dual.)