Bolt wrote himself into the history books when he retained his 200m title on Thursday, following his successful defence of his 100m crown earlier in the week.
“I think it’s going to be a hard mission,” Bolt said of racing in Rio. “Both these guys (Yohan Blake and Warren Weir) are 22 — I’m going to be 30, they are going to be 26.
I think I’ve had my time. In life everything is possible, but for me this is going to be a hard reach.” Bolt added: “I think when I get to 30 I will be thinking about retiring,” Bolt said.
“Yohan Blake is running 19.4 already, he’s running 19.7, so in the next four years he’s going to be firing. I think I want to get out before he starts running too fast.”