My tolerance to cold varies a great deal according to what I'm doing, if I'm hungry or full, drunk or not..., and how my immune system is doing. If I'm cold, my body is telling me that I need to do something about it, or I will end up sneezing and miserable. I don't think it's changed with age. But I'm better at dressing the cold out.
But Norwegian has two different words for distinguishing between being cold ("kald"), and feeling cold ("fryse", literally "freezing"). Being "kald" just means that you can feel something is cold but it's not bothersome, i.e. you're generating enough heat from inside. But if you "fryser" it means you're bothered by the cold, feel uncomfortable and need to warm up.
The tipping point between those two states changes from October to February
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett