Reliability V70/S80 at age

Hello together, I looked at an early V70 III AWD from 2007, basically I liked it quite well, but unfortunately the PDC sensors and the alternator (‘generator defective, urgently visit workshop’) were defective. Are the known ‘children’s diseases’ or is that more the exception? What does it look like with the series/generation (the S80 II is closely related) with the reliability in old age? Does the AWD have problems (in the V70 II there were probably problems with the angleget Thank you and greetings Sebi