I voted no, but I'm still fitter than many people my age (especially other truck drivers). But I'm not as fit as I was when I was commuting 50 miles a day and doing weekend audaxes. And when I didn't smoke.
But I'm still reasonably thin, even though I am 15 stone.
I would say no, because I know I could be so much fitter than I am, but I'm lazy and haven't got off my arse that much this year. Last year I was on the bike a lot and therefore was pretty fit, I weighed about 70kg (I'm pretty much 6') and did a lot of long rides as well as hill walking but this year I haven't been out on the bike as much (though I do enjoy it a lot when I do) and the little swimming/walking/climbing I fit in is not much compensation!!
Having said that, though, on the flipside of this, I can 'push myself' to a greater degree than most of my friends, I seem to be able to block out the pain and carry on. I don't know if this is a good thing or a bad thing, really, as it does mean I get more injuries, feel horrible afterwards, etc.
Oh, physically fit! I thought you meant sexually!!
I'm probably fitter now than I was in my mid 20s-mid 30s. I worked a lot as a hod-carrier, played a lot of rugby and cricket, drank (not too much, possibly a bit sometimes) too regularly, and ate like a demon. Then I was about 108 kgs, fit, perhaps, but not healthy, or the other way around!
Now, my physical efforts are restricted to cycling and golf (if that counts), plus walking, and skiing occasionally. I'm much more disciplined with what I eat, drink lots of water, get plenty of fresh air, don't (never have) suffer with stress, and weigh 92 kg. And I'm 47.
I have maintained a good standard of fitness through my life, but I regard fitness as one of those elusive goals. There is always a level higher that I know I could get to if I trained more, harder and with consistency. So, I am a lot fitter than most, but I do not regard myself as fit.