Great, now my brain is old, too

I usually joke that my body feels 10 years older than my chronological age, and now I come to find out my brain age is 10 years older, too! Hubby bought a Nintendo DS recently along with some games to improve visual and mental acuity. Each day, you're to complete a handful of short exercises and it tracks your progress and estimates your brain age. Hmmph. It says my brain age is 10 years older than my current age. I try to blame fatigue, distraction, or even aversion to any video game-type device, but I must admit the truth - my brain is just out of practice. Just like my body is showing evidence of lack of exercise, so is my brain. I've spent the past 5 years speaking preschool dialect, watching animation instead of documentaries, and spending fewer than 15 hrs a week in adult conversation. I love being a mom, but I have let intellectual decay become an occupational hazard. This is evidenced by my horrible Scramble scores! Not sure what the fix will be, but let's hope my brain isn't aging exponentially.