Newey says he continues to "love" his job but admits time might be running out for him in F1.
"I have the chance to do what I always wanted to do and to love my job. I loved this job," the 64-year-old said, as reported by Auto Hebdo.
"Of course, my career can't last forever, so I think as long as the team wants me and I keep having fun, I'll keep going. But it has to be realistic, it's a countdown. I don't know when that day will come.
"My dream has always been to be a racing engineer. When I got my first job and my first salary, that was a big moment. Everything else was just a bonus."
GPFans is a multi-platform, multi-language brand dedicated to Formula One coverage. We bring you all the ins and outs of the sport, 24/7, everything from up-to-the-minute news and features to the latest viral stories and clips.
We believe that a new generation of exciting, outspoken drivers will make F1 more popular than ever before, and we want to give our users access to as much of their heroes as possible, on and off the track. From Lewis Hamilton to Max Verstappen, Daniel Ricciardo to Sebastian Vettel, we provide in-depth analysis of every every Grand Prix in the season, from Australia to Abu Dhabi.
With Formula One under the new ownership of Liberty Media, how the sport is being covered is evolving, and GPFans will look to be at the heart of this progression into new media, as one of the fastest-growing sites covering the king of motorsports.