Yes I Remember This From Biology Class.
Jim I Am Sure You Have Noticed Your Skin Is Getting thinner.
I Have Noticed This A Few Years Ago, On My Lower Legs.
My Skin Tears Easier Also Like When I Snaged My hand On A Nail, Like I Did Yesterday, And Started To Drip Blood Onto A Customers Linoleum.
I think This Has Something To Do With The Skin Cell Limitations To Divide.
I Would Also Think That Your Ancestry May Also Play A Part Depending On Where Your Ancestors Came From, And other Genetic Factors.
I Have Often Believed That Living Underground May Allow You to Live Longer Due To The Shielding Of the Ground Cutting Out Some Of The Radiation From The Sun.
Also This Lengthening Of Life May Come With A Cost, Like You May then be More Susceptible From Exposure From The Sun And Other Bacterial Elements Due To Living In A Confined Space. Not Saying you Would Notice them but Your Ancestors Years From Now Would. Like A Simple Cold To Us Could Cause You To Die In The Future.