Just wanted to put this out there to get feedback:
After attending a BS Revisit Day, both DH and I noticed that a significant number of parents seemed significantly
(10-15 years) older than ourselves. I would have guessed that the average BS parent started families around 30, so ages would be 45 if BS kid were oldest, and about 55 if BS kid were youngest. Yet we noticed parents who seemed to be 65 or older, and they were parents, not grandparents. Thoughts???
What you’ve stated is what we’ve experienced. Being in the range you expected (45-55) we often found ourselves on the younger side but not the youngest. Definitely many in their 60s. Some started marriages later, some second marriages, many BS kids I know are “oops” babies with siblings much older. I would say, however, that the older parents tend to be quite fit for their ages.
My husband and I are 41, we started early 
Maybe they are in their 50s and just looked old to you, you whippersnapper.
Looking around at Parents Weekends and revisits, we have always felt we were on the younger side of things at 29(44!)/45 respectively. Our oldest is 17.
We’re both 48, oldest kid is 16, and I’ve always felt like most of the parents around us at Parents Weekends were about in the same ballpark of age, give or take maybe 5 years. But certainly there are the occasional parents who seem to be fairly significantly older. Not too many that are significantly younger (i.e., 30-somethings).
We’re both 48 with kids at 18, 15, and 13. I’ve always felt the majority of parents where within a few years of our ages. I don’t recall too many folks that I would have thought were 60+ when I’ve attend BS events.
Just as I was turning a childless 40, I went to the doctor for something routine and found out I was four months pregnant – after being with ChoatieDad for almost 20 years and being told we couldn’t have children. Yeah, we’re older.
We will both be 47 this year (kids turning 15, 11 and 7). Most of the 9th gr parents at our daughter’s BS seemed to be around our age or a bit older…low to mid 50s. I am definitely the “old mom” in my 6 yr old’s class so if he goes to BS in 9-10 yrs, I will be the old mom there too.
We are both 48. My kids are the same as yours @NYCMomof3.
We are right there with year of sheep (this year, multiple of 12). I hear of high school friends who have kids ages between 2 (yikes!) and 24 years so there is much spread in marriage and children’s age these days.
Wife and I (first marriage) were married and had kids before many of our friends. One friend on second marriage is 44 and has 3 kids under the age of 5.
We are 50 and 52, with kids 19, 18, and 14. We were in the middle for the group of parents at Revisit Day, but there were a good amount of 60/65+ couples.
I became a mom at 44.
We are 56 and 58 with a sophomore kid (15). Kind of seems like we’re in the older side of middle, but definitely not oldest, at parents’ weekends.
Married at 34, kids at 37 and 39. We won’t be done with BS until '17 . . . Not very many seem older than us at school, but there are a handful.
I am 44 and my husband 45, with a 15 year old and a 13 year old…and I was flashing back to the realization that my own parents turned 40 the year I graduated HS and how very young they were, though of course I couldn’t appreciate that as an 18 year old! Pretty sure I didn’t see any parents even in their late 30s at revisit days or parents’ weekend!
yeah, I find it hard to believe that my mom had all her kids married in her 50s and had three grandkids by her 60th bday. I’m secretly hoping my boys would get married at 23 and have kids at 24, before I get too old, ha!
My parents must be young. They’re 43 and 45 with a 14 and 17 year old. I thought that was pretty average for parents, but I guess not.
That probably will be the case for my mom. 
@payn4ward