It depends on your lifestyle and other factors
Guys who play sports like rugby, gridiron, people who lift things daily with poor posture are likely to lose more than folk who have less stress on their overall body.
Arnold Schwarzenegger was 6-1.5" he's now around 5-11 so it is possible to lose a fair whack depending on the stress your body is under in life. Sadly some people have a lot more physically demanding life than others and as a result usually lose more. David Prowse is another good example he weightlifted when young pretty heavily and he had arthritis and has lost a good 3-4"