Thanks, all. I knew I'd find sympathetic ears here.
It's certainly not the first time I've gotten comments from men out on the street -- try going for a run around any city and it's inevitable. Maybe the form-fitting workout gear is just too hard to ignore. But there is a spectrum of behavior ranging from "acknowledging glance" to "hey, how ya doin'" to "leer and rude remark," and most of what I've encountered is closer to the benign side of that spectrum. And for crap sake, I'm a lumpy middle-aged woman! I can't help but wonder what the cute young women get thrown at them.