The weight of the deer depends on the habitat that it lives in. The more food for the deer the bigger it will get. If you hunt in an area with farm fields you can expect deer to go well into the 200 lbs range, but if you don't a 200 pound deer is not common. I live in northern Michigan where a big deer is 160 - 180 lbs. The average deer weighs about 120 - 130 on the hoof. The habitat is mostly oak trees and cedar swamps. The good food is not there. My dad shot a 12.5 year old doe that weighed about 120 dressed. On the flip side i shot a 7.5 year old doe that weighed 130 lbs dressed.

As far as determining age, the DNR does not count the teeth, but they look at the wear on the teeth. A deer's teeth will wear down over time. The DNR guesstimates the age by wear and will give an absolute age if they take a tooth and cut it into a cross section. Like trees, a deer's tooth has growth rings on the inside. For every year the tooth grows a ring.