![f013-01](https://article-imgs.scribdassets.com/3vj6r229mocorlq9/images/fileW2ZIOCTP.jpg)
: more candles on your birthday cake needn’t mean a slower marathon time. A recent study* found that, by contrast, even well-trained marathoners who are north of 35 can improve their VO₂ max and marathon bests. The study looked at runners with marathon PBs around