by Claudine Zap She may use a walker, but don't underestimate the staying power of one Agnes Albinger . Like many Americans she faces the nightmare of foreclosure . But at 100 years of age and having spent 60 years on her farm, she certainly won't leave now, debt be damned. And you kind of have to believe her. The woman many call Aunt Aggie, according to a story in the Chicago Tribune , raised 40 foster kids single-handedly, and farmed the 70 acres of land herself. The widow,