Maximum age to adopt?

Liana was born when I was 44, and came home when I was 45. I'm 48 now, and seriously considering a second child. Rather than an infant, I am looking into adopting a toddler, 1 or 2 years younger than Liana. I LOVE being a mom. You know, so many of the parents of kids in Liana's preschool get babysitters and go out and do exciting adult things. I've DONE exciting adult things. I cannot think of anything I would rather do on a weekend than go to a zoo or a kids' museum. I haven't seen Avatar yet, (I'll see it some night after Liana has gone to sleep), but I LOVED Toystory. Ok. I miss SCUBA diving on vacations. But make-your-own-ice-cream-sundays are fun too. :) I used to shoot a mean game of pool. Last week on vacation, I learned to play miniature golf. Liana is a natural. My back isn't great, and I can't carry her on my shoulders at parades. And maybe I don't "run" as much as I used to. But other than that, I can't think of anything a younger parent can do that I can't. I have more patience than I did when I was younger. I'm more financially secure. And I don't have the restlessness that I had well into my late 30's. I'm glad I became a parent later in life than most. I have DONE so many things, that all I want to do now is focus on being a mom.