I'd go with a 14oz training/bag glove with good protection. Not that 36 is old of course, but being away from it for a while, you'll want to make sure you take it easy on your hands. 70lb or 100lb is really up to you, although I would still get the 100lb bag. Even more important is bag selection though. Try to get a bag that has a good soft fill, and even a foam liner. Both Ringside and Title make those type and they are very high quality. They'll make it a bunch easier on your hands.
For gloves, check out the Boxing Equipment review section. There are a couple of very good options there right up your alley for great had protection.