Christine F, that may be true. When I was young, I don't think it occurred to me to worry about that kind of stuff. (When I was in high school, a trainer told me she had exercises to make my thighs thinner--I thought she was nuts) And I probably didn't need to worry. I had a pretty decent little bod, if you like soccer thighs, including a bubble butt. As my weight has fluctuated over the last few years, there have been times that I can put on pants from high school. There is always an awkward poof at the top of my butt, about as big as my hand. If not for that past, I don't think I'd mind the way it looks now.
BTW, the trainer I wrote to, Cori Levkowith, really helped me get back on my feet (literally) when I pulled my back so badly I was crawling around our apt on hands & knees for a few days. She borrows from PT as needed, and has several programs that focus on the low back/butt area that you mention, and started me with exercises from her Booty Burners. It's a silly name, but solid exercises and science. She's at Redefining Strength online. She has tons of followers, and I swear she remembers every single one of us and what's going on with each person.