Let's put aside the unsubstantiated claims about biology (and old doesn't mean 70 yrs in this context). Jobs that rely heavily on attention span and learning s

Let's put aside the unsubstantiated claims about biology (and old doesn't mean 70 yrs in this context). Jobs that rely heavily on attention span and learning speed can also quickly get boring and unfulfilling--the more experienced folks probably know to steer away from that.