"In the last three years, I'll have had almost two years off, depending on when we play cricket again," Warner was quoted as saying by cricket.com.au.
"The longevity in your body helps. The get-ups of training and playing gets harder as you get older but I haven't felt any fitter in my career than I do now.
"As the legs get older time will tell. At the moment I'm feeling as fit as a fiddle and if I can keep running between wickets as well as I have done, who knows. That (2023 ODI) World Cup is the ultimate goal," he added.
Warner also hinted that he might step away from the shortest format after ICC T20 World Cup 2021 in India.
"If you're playing as good as you can and doing the best you can for the team and you're helping and benefiting them, I think you do want to keep playing as long as you can," Warner said.
"There's back-to-back Twenty20 World Cups, and I started my career with Twenty20 cricket, and I think it's important we've got younger kids coming through and they get a sniff and a chance of playing at this level as well."