I was a somewhat older mom as well, 27 for first one and 37 for last one (and 4 in between). Two of my friends who are within a couple of years of my age have DGDs my daughter's age and great grands only a few months younger than my DGS.
And yes, I totally agree about lacking the energy!
Not sure the patience was there either...I remember when DD was a teenager, one time #5 son came home and DD & I were both hollering at each other at the top of our lungs. He asked what we were fussing about and neither one of us could tell him!