How frail can hydrangeas grow to be? My parents hydies are about 32 and my grans are roughly 55

My parents hydies are about 32 and my grans are roughly 55
Answers:    Well my sisters beats that! Her house is 124 years mature, and there are two bushes planted when the house be new. A Hydrangeas is one of them,the other is a Rhododendron. Tell Grans ,hers is still a newborn! Byee
I have never hear of a time limit on the existence of hydrangeas. I would guess as long as they are getting the nutrients, sun and water they call for and avoid diseases, they will go on indefinitely.