Because of our ages now (I just turned 43 and DH is almost 51) we do not qualify for the majority of countries that do adoptions and the few we might qualify for turn us away because of our weight. Domestically, we realize some pregnant teen isn't going to choose us over young perky "Ken and Barbie" when they look at all the listings of people who want to adopt.
We are looking into becoming involved with the foster system with the goal to adopt a little girl to complete our family.
Robin - be careful about your decision to go into fostering, especially with hoping to adopt - your hopes and dreams will be crushed many times over, and you could end up adopting someone out of desperation and optimism. Caseworkers are very human, and under a lot of pressure to say what you want to hear ("it will be a slam-dunk to terminate his bios parental rights" - "you're his only hope" - "of course you'll get support money for his therapy and his group home needs and his medical and when he burns your house down, etc etc etc.") and find people who are willing to be permanent homes (but who often end up just being on call and never getting to adopt, especially if they actually have any sort of hopes of a specific child.) However, TPR is only VERY rarely a slam dunk. Many times the judges, who are the only ones who have a say in the matter, look at a bio parent who originally left their kids out in the street while they went to party, and haven't seen their kids since they went into foster care, but who suddenly got religion and brought a broken toy to a visit at the visit centre two days before the court case, as "improving" and will give them chance after chance to get their kids back, and may send them back on technicalities, or send them to relative who have never seen them, or if a caseworker has a "favourite" couple in mind...
Even little kids can come into your home greatly damaged and unfixable. We had a four-year-old boy with Fetal Alcohol Syndrome (basically his mother cauterized his brain with booze while she was pregnant) who threatened to kill us, set the house on fire, attacked our daughter for no reason, had complete breaks with reality, etc, etc. From reading about FAS, I know that he doesn't have the capacity to get much better. The couple who adopted him basically got a pat on the head and assurances that all he needed was a loving stable home. The workers didn't tell the couple that the loving stable home needs to be prepared to make all of his decisions and be his external brain as well as psych ward for the rest of his life if they don't want him to end up in jail.
I'm not saying don't do it, but be completely prepared and go in with your eyes open. fosterparents.com is an amazing group of people to steer your research.
Like I said, we're happy to be back to three - fostering was a very long year for us, and I'm not sure we want to do it again.