Re: Milk Supply
A lot of mothers see an increase in production with a second child. It's fairly common for mothers who breastfed the first with no problem to develop oversupply and/or overactive letdown with the second.
No one can predict what will happen for you, but just wanted to let you know that the possibility is definitely out there that your supply problems will fix themselves with the second baby. I don't see any reason why your age should be a factor . . . just read an case study about a SIXTY year old woman who had a baby (implanted embryo, not her own) in the Netherlands. Her midwives treated her exactly as they would any other mother and she was able to successfully breastfeed her baby.
Be kind, for everyone you meet is fighting a hard battle. Plato