I'm 18, a freshman in college. I went to get Black and White with my 20-year-old boyfriend, three 21-year-old friends, and a 23-year-old man that had already graduated driving. None of us thought it strange whatsoever, and we all had our DSes open and playing in the mall after we got it, and at the restaurant afterwards.
I played HG in my Engineering lecture earlier this semester. I heard a gasp and a girl ran up to me, talking about my DS and Pokemon. She had brought her DS to school, but felt too intimidated to play it in public or try to connect with other people in the school because she would look either too nerdy or too old. She said I inspired her to embrace it.
Another time I was playing and transferring Pokemon to my Pokewalker, and a guy waiting for his class started having a Pokemon discussion with me. And earlier today, I connected with a 24-year-old Calculus TA who enjoyed Pokemon, who before I had despised. Pokemon bridges gaps regardless of age.