I've loved having my dd in my late thirties and dp is 10 years older than me 
I love both being comfortable enough in our careers that I can be part time and afford lots of treats for her. Life is more settled for me later in life. We have a beautiful home and garden and none of the stresses from my twenties....
However had I not left it this late.... she may have had a sibling that hurts a bit ....and I do worry a tad about being oap parents 
Swings and roundabouts I guess