I have five, although my eldest three are 28/25/22 I then had an 11 year gap between the youngest and was divorced and single for quite a while.
When I met DH in my mid 30's he was a couple of years younger than me and didn't have any ( very young ) children so we had another two who are now 12 and 8. He has always been a wonderful step-dad to my other three so it was a no brainer to have one ( which turned out to be two in the end ) with him.
It's not the same as having lots of young children at once but I love it at Christmas and love it when they are all together. The older ones adore their younger siblings, and vice versa.
We aren't financially responsible for five so I guess that makes a difference but DH is a higher earner and our youngest DC are in independent education and we are very comfortable, youngest DS still gets his brothers hand-me-downs though!
I am lucky enough to be a sahm through choice, I went to university when I was a single Mum to my older three dc and that was hard work and we were quite hard up.
I always said to DH if i could have I'd have had one more after our youngest DC, it has has been the best journey being a Mum again and I love every minute of it.
I never ever take for granted how lucky we are, I am so glad I had each and every one of them. I am looking forward to being a grandma with eldest DD (28) in the next few years as she is getting married this June.