I'm 45 and it would be close. I was a CF in college and could run pretty well. My first step (s) aren't what they used to be, but I haven't lost much top end speed.
For 20+ years I've been a PE teacher and coached a lot, and I've stayed in pretty decent shape running and lifting with my players. I've never gone long periods without doing athletic things. IMO that's the key, use it or lose it.