My sister is 70 years old and lives in another state (FL). She called me tonight and was very excited to tell me that she retired, finally! She said she didn t sleep at all last night and was very tired, but kept talking for 90 minutes! She repeated herself over and over again about the same subject. She was talking very rapidly and some of the things didn t make sense. I m a little worried about her. She said she feels very good physically because she has been going to physical therapy for her knee and doing exercises for about 4 weeks now. She told me over and over she s invincible! Should I be concerned?