A LIFETIME spent fighting fires, a passion for helping those in need, and a desire to stay fit keeps 73-year-old Pimpana resident Graham Flack on his bike for hour after hour every week.

Mr Flack completed his eighth Bike4Burns charity ride recently, clocking up 750km in the saddle over a week riding from the Gold Coast to Brisbane via Boonah, Killarney, Toowoomba, Blackbutt, Toogoolawah and Mt Crosby, all in the name of charity.

Mr Flack and his emergency service colleagues raised over $30,000 for the Children's Hospital Foundation burns research unit with their ride.

The former firefighter, who lives at Halcyon Greens retirement village, admits at age 73 he doesn't mind being the oldest cyclist on the Bike4Burns tour.

"The young blokes just liked someone to remind them their best years are yet to come," Mr Flack said.

"I enjoy the banter of the youngsters, it's satisfying to watch them try and chase me up the hills, it's just good fun doing it and I probably do it because I still can."

He said the toughest aspect of the Bike4Burns charity ride was the training.

"I started months ago at the height of the Queensland summer, but if you don't train properly you'll hurt yourself," Mr Flack said.

He attributes his success to the support of his wife Del, the range of riding tracks accessible in and around Pimpama, and the regular aerobic classes he attends at his retirement village.

As to what's next, Mr Flack is likely to line up for a ninth Bike4Burns event next year and is considering participating in the next Australasia Police and Emergency Services Games in Perth.