"Age Is Just a Number"

• http://www.nytimes.com/2016/04/25/opinion/the-mathematicians-90th-birthday-party.html?action=click&pgtype=Homepage&clickSource=story-heading&module=opinion-c-col-right-region®ion=opinion-c-col-right-region&WT.nav=opinion-c-col-right-region&_r=1