Right Color for my Age

Hello all.  I have been searching and searching for a site to give me some thoughts about hair color.  I am 37 and look younger (at least I've been told) but am feeling all of the 37 years and I'm starting to become very concerned with the wrinkles I am developing.  I want a hair color that is not going to wash me out and make me look older.  I have dyed my hair since I was in early 20's (staying b/t dark blond w/highlights to light brown w/highlights.  I want to color my hair a medium/dark brown w/highlights and maybe a few low lights but I do not want to older.  My natural hair color growing up was medium brown.  I'm so confused by the whole skin tone thing and can't for the life of me figure out what what exactly my skin tone is i.e. cool, warm, etc.  I feel like I'm pale w/ freckles but I do have light brown eyes that have gold flecks in them.  So having said that, I feel like since I have the pale skin dark brown is not for me but yet I feel like it will bring out my eyes (but not the wrinkles/bags under my eyes).  Can anybody tell me if going darker will, in fact, add to the wrinkles, make me look washed out or brighten my face.  I know I have somewhat pinkish skin if that makes sense.  I'm just confused not to mention tired of the whole blond thing.  I want to go brunette b/c I will not have to color my hair so often and will be able to save some money BUT I would rather spend the money to look better.  Any advise would be appreciated very much.  Thank you.