25 & So Bitter

There is someone I know now who is only 25, yet she has job experience under her belt that makes her seem beyond her years, she's obviously smart, and has a strong head on her shoulders. But sadly, I find her quite bitter and very set in her ways already for her age. How is she going to be by the time she gets to my age? Let loose and live a little. Be 25 as it only comes once and then it's gone.