The life span should be good. I got a 2000 V6 with 189k on it and hardly anything has broken on it throughout its lifetime. My mom bought it new in 1999 and gave it to me in 2014 so I know how it was maintained, and let me tell you, my mom didn't take good care of it. Sometimes it went 6000 miles without an oil change. I remember changing the alternator and the passenger side header cracked about 5-6 years ago. Those were the only real mechanical problems we've had with it in 16 years. Oh yeah she sent it to some mechanic who changed the water pump not too long before I got it. Other than that it's been bulletproof. Only other minor things like spark pugs/wires and batteries have been changed. My entire suspension was shot so I recently replaced all of it. The LCAs and tie rod ends were destroyed. The ball joint was shot and I'm lucky the wheel didn't fly off. I got a deal on some KONI STR.Ts so I put those on. The suspension is to be expected though. I live in Louisiana
and 16 years of driving on horrible roads filled with potholes will destroy your suspension.
My head gaskets have never been changed. The motor's never even been taken apart. I don't know how much longer it will last but it seems strong. The gas mileage is awesome. It's just lost a ton of HP due to age. I'm modding the hell out of it to change that though. LOL