Why are Soviet milfs so ugly, yet Soviet younger women so damn hot?
MILF = Mother I'd Like to Fuck
You like to fuck ugly women?
Different culture and lifestyles. But that is changing because population in most developed countries is getting older and their needs at different stages in life are changing.
In the past, strong moral which was only acceptable thing by society forced people to get married young, breed kids, their kids did the same and they ended up as grandpas and grandmas at late 40ies. Grandma had a certain role in family, just like mother. Sexuality was repressed, there was no need for them to be hot anymore, nor they could achieve it.
Today, thanks to miracles of modern medicine and popularity of fitness and lack of multiple children to take care of, modern mother and even grandmas spend time trying to stay fit and seem beautiful through invasive cosmetic procedures.
Sheeple or majority of population were always following a trend. That trend used to be function over form. These days, it is mostly form over function.