Steps per day

Doctors recommend:

• 7,000-10,000 steps per day for adults aged 18-59 years
• 6,000-8,000 steps per day for adults aged 60+ years
• 7,500 steps per day for women aged 62-101 years.

The current federal exercise guidelines suggest 30 minutes of brisk walking most days, which translates into 3,000 steps taken at the 100-steps-per-minute pace.  I take a rollator, so I can sit down if I stop to talk to someone else out walking or if I just get tired.  Wait, I just noticed that 7,500 steps is more than the minimum for 18-year-old kids!  That doesn't sound right.  How can that be right?