The Brit singer admits he was concerned for their health as they got older, and so felt the need to do something about it.
“I think any kid at my age starts getting worried about their parents' health. I have bought them a cross-trainer and built them a swimming pool,” he told The Sun.
“They are now training and swimming every day. I want them to be able to hang out with their grandkids for a very long time.”
The singer recently hit Aussie shores to promote his latest music and admitted he enjoyed his time in the Southern hemisphere so much he would be keen to move to New Zealand.
“I did ask for [New Zealand] citizenship [while I was there] and I think we got an email from someone involved with that,” he told The Daily Star.
“So maybe that’s going to happen. I could be a citizen.”