15 years ago post op. I hadn't dilated for years, and was concerned about depth/width so I did it again the other day.  I was amazed I had apparently not lost any depth or width! Not something I recommend though.  Remember, skin can be made to stretch longer & deeper if you take it slowly, don't push or tear anything.   My partner on the other hand has nearly completely atrophied from never dilating, so I think its all personnel.  It was her choice not to.