If it becomes such a chore that I feel it is a job instead of a pleasure it will no longer be something that I maintain. At my age my friends tell me I have to consider limitations. Then I remind them of the summer I was on crutches and hobbled about every few days watering all my plants during a drought. I will have to be really challenged to stop playing in the garden. Recently, I have developed vertigo so some days I carry a staff while gardening..... other days I fall about a bit. It does keep the dog entertained.