as for international, I know mostly about China. Yes, China has become more restrictive, but you aren't too old. They also have financial requirements, a BMI requirement (as does Korea), health requirements, and you can no longer be single or gay. I don't know your situation on all those, but you aren't too old for China. However, China is currently in a slowdown period. No one knows how much slower it might get, but IF things keep at their current pace, you'd be looking at about a three year wait. I really can't recommend that to anyone at this time. Things can change at any time, of course, but I think China would be frustrating right now unless you wanted a special needs child which speeds up your wait considerably.
Vietnam has recently re-opened for adoption. Many people are looking to adopt from there. I've heard that Guatemala is a bit iffy because they are having a tough time getting control of the corruption there. But for now, they are open for adoption and have rather young infants for international adoptions. India, Haiti, some African countries, Taiwan, Russia, and the Ukraine are some of the more common programs. Russia is in a temporary stoppage, but I've heard (quite recently--see below) that it's common and definitely temporary. I don't know what it means for a timeline, though.
I've read that India is wanting to find homes for the many children they have, so they are trying to streamline the process so you'd only have a wait of forty some days after your paperwork is submitted. That would be remarkable, and it's worth looking into.
With domestic adoption, you get an absolute infant, but you also get a lot of unknowns. However, you never know what a birthmother would consider, and your age might not even come into play with some mothers. It's just one of the unknowns.
I think as you read about the different programs, you will find yourself drawn to one or two. You just have to know what is important to you (cost, age of baby, time required to travel, if you can adopt two at once, etc.), and some programs will then pop out at you.
Good luck!