This is totally anecdotal and not scientific, but I have lived my entire life in the same community so I have seen most of the kids I grew up with get old. One thing I have noticed is the hottest girls from high school (those who had fully developed women’s bodies at 16 or 17), seemed to have also aged faster. The formerly hot girls now in their 50’s look like they are 70, and the skinny, plain, nerdy high school girls now look really good in their 50’s.
There are likely a lot of lifestyle factors affecting this, like smoking, alcohol and drug use, childbirth at a young age, and intentional sun overexposure in the 70’s and 80’s, but I still find this to be an uncanny phenomenon - at least here in my hometown of Miami Beach.
Early bloomers are early age-ers, so the theory goes, and kids who look younger than their age or are uninterested in appearance-competition when they're younger, are going to remain looking younger and are probably better at keeping physically fit rather than keeping up with trends. Generally speaking. I've made similar anecdotal-level observations as well. The real trick is to keep the fat off for as long as you can.