be careful before you believe bio statistics. biologists are notorious for pulling stats out of their nether regions. the whole flu shot/heart attack stat may just be indicative of people who receive a lot of preventative medical care vs those who dont see a dr unless something terrible happens.
brushing your teeth less than once a day triples your risk of heart disease (probably indicative of poor overall hygiene, nutrition, and medical care as opposed to just brushing teeth, but hey lets not let science kill a good headline)
http://www.nhs.uk/news/2010/05May/Pages/clean-teeth-cuts-heart-disease.aspx
all that being said, i have never had a flu shot. however i am having a kid soon so i have to think of the kid being in the high risk category as part of my decision this yr.
you mentioned you were getting up there in age and thus are probably high risk as well. as such, it probably makes sense to get one.