'Young at heart': Ziplining grandpa takes flight on 81st birthday

For 81-year-old Don O'Keefe, age is nothing but a number.

Last year on his birthday, O'Keefe gave rock climbing a whirl for the very first time.

• Happy 80th for brand-new rock-climber Don O'Keefe

This year, he took it to the next level: heading to Petty Harbour and flying through the sky on a zipline.

His daughter Cathy Russell saidher "young at heart" father went on the adventure with his 20-year-old grandson, Alex.

She said the duo hiked about a kilometre up the hill before starting the ziplinecourse.

"He said the hike was a little strenuous but his grandson helped him," said Russell.

Once he got to the start of the course, Russell said her father had no trouble keeping up.

Time will tell what's in store for his 82nd birthday, but few things seem off the table.

What about skydiving next year?

"Don't tempt him, he probably would," said Russell.