Safe from a privacy perspective. Otherwise they're very unsafe by modern standards. Minimal airbags. Often no ABS. What ABS that is there is less sophisticated than modern systems. Worse structures for crash protection. No stability control. No traction control.

Plus they're just old. Last year, I spent more on my 20 year old car than I did on my 2 year old car, that includes loan payments on the new car, fuel, tires, insurance, and maintenance.

Get something from this century at least.