Definitely. To me, the point of saying "martial arts are for life" is to put that full range of practice (and the purpose of it) into context. When I was teaching, I took two views of this saying:
- The purpose of training MA was for life, not for the sake of the MA. So I included practices that would benefit later in life. For instance, we specifically challenged balance (and I included some of those challenges in the forms), because as we age, that's something that degrades. Creating a better baseline to degrade from, could mean fewer falls in their 80's.
- MA is something you can do your entire life. This one was harder for me, because as I age, I become less and less able to take the falls some of our techniques require. And less able to take as many falls as being an involved student of NGA would require. So I emphasized some other areas of the art (which had pratical benefits, too), opening up areas folks could continue to study as their bodies became less able to take 100 falls in a class.
So you could apply these same views to anything - like golf. When playing golf, if you think of using it to improve your life, it's better to walk than use a cart (though it's harder to find places that allow it). If you think of making it a lifelong practice, you have to give up the idea that it's only fun if you can out-drive everyone else.