The Amer­i­can Can­cer Soci­ety has made new rec­om­men­da­tions on the required tim­ing and fre­quen­cy of mam­mo­grams. The new guide­lines say that women with an aver­age risk of breast can­cer should begin get­ting annu­al mam­mo­grams at age 45 (was 40), and also that women age 55 and above should cut back to every oth­er year (was every year). Marin doc­tors disagree…