. >> reporter: if the researchers are right, and this s st of seven risk factors really do play a big role in developing alzheimer's, then there's reason to hope. the researchers say if everybody reduced their risk factors by 25% -- smoking 25% less, exercising 25% more -- then half a million new cases of alzheimer's could be prevented. so, are you telling us today that you believe that alzheimer's disease can be prevented? >> if you look at it as a part of a comprehensive look at brain health, yes. >> reporter: so, the message hy. tonight? throw out those cigarettes. reach for the crossword. and get off that couch. it's good for your body today and possibly your mind tomorrow. liliey davis, abc news, new york. >>> and coming up, boomer couples and the good life. reinventing what it means to be married. i'm phil mickelson, pro golfer. if you have painful, swollen joints, i've been in your shoes. one day i'm on p of the world... the next i'm saying... i have this thing called psoriatic arthritis. i had some intense pain. it progressively got worse. my rheumatologist told me about enbrel. i'm surprised how quickly my

in your 30's and 40's and you have them into your aging process, you are not going to have a comfortable old age. you are also seeing in terms of epidemics, an increase in alzheimer's and it is going to increase as the population increases. there are quite a few seniors who have mental health problems but they are also, the majority of seniors, who are hard-working, who had minimum wage jobs their whole lives, who paid social security. think about living on $889 a month in the city of san francisco needing to buy medication, one meal a day, hopefully, and health care. if we could provide health care early on we might prevent (inaudible) and people would be less likely to end up in the emergency room with a drastic outcome. we could actually provide prevention and health care to people who had no other way of getting health care, those without insurance, it might be more cost effectiti >> the mayor, the office of workforce development, kick off a new program which is to engage some of the artists in reinvigorating the streetscapes. organized in partnership with neighborhood based economic development organizations, the art in storefronts taps into the incredible cre