Really! That low? On Intel?
I know it's possible to get that low, but I wouldn't have said 65 is anything to worry about either.
I'm happy if they're sat mid 70's. I've got i7s that have been sat at that with months of stable uptime. They might complain long term, but you're not going to kill them off at 65, even with added vcore.
I realise mobile processors have higher limits, but my MBPs rock along in the 90's 24/7.
70*C on a desktop CPU is bad. On a mobile is ok.