I feel the cold terribly and training in winter is hard for me however i find I'm generally ok with lots of layers. It's my hands that I just struggle with. I've yet to find a pair of running gloves that prevents my hands going completely raw from cold- yesterday it reduced me to tears!
I'm in my 30s too and since about September, was getting terrible 'growing pains' aches in my legs- mostly my thighs but sometimes my feet and knees. I used to get the same pain from the age of 10 in my knees! Hence the growing pains thing!
Only in the last few weeks has the pain ceased. Absolutely no idea what causes it or makes it better. Physio thinks its some kind of doms.