It’s just after 10:30 a.m. on a pleasant weekday morning at SENS, a biotech lab in Mountain View, California. I’ve come to speak to its chief science officer, Aubrey de Grey. I find him sitting in his office, cracking open a bottle of Stone pale ale. “Would you like one?” he offers hospitably. De Grey drinks three or four pints of ale a day, and swears it hasn’t kept him from maintaining the same vigor he felt as a teenager in London.