An orthopedic surgeon at 1010 Park Place discusses how aging is "bone deep," leading to muscle mass loss and volume shifts in the gluteal region after age 50.
For short-form fiction or specific erotica focused on these features, you can find titles like on Amazon. Physiological Perspectives mature bbw butts
There is a series of photo-focused ebooks titled which has dozens of volumes including: Mature BBW No. 51 (280 pages) Mature BBW No. 61 (263 pages) Mature BBW No. 71 (219 pages) An orthopedic surgeon at 1010 Park Place discusses
Some sources, such as Leading Lady , argue that larger glutes can provide support for back alignment and improve posture. Mature BBW No.61: MILFS & MOMS Naked Photo eBook such as Leading Lady