How is it that the WI-38 cell line isolated by Hayflick in 1962 is still very much around and not affected by the 'Hayflick Limit'?
The answer is that the majority of the cells were frozen from very early in their Hayflick lifetimes e.g. after 9 population doublings. They have been thawed out judiciously and only as needed thus preserving a lot of frozen stocks.  When an ampule of cells frozen at, for instance 9 population doubling, is thawed, the cells pick up where they left off and still have 41 doubling a to go.  So the magic of exponential growth combined with the fact that they keep dividing after being thawed has made for a decades- long supply . Does this answer the question to your satisfaction?