Hi Elsa,
Based on that photo alone, I'd put you mid to late 20'ies. Other factors that would influence people you meet in the street, would be your fashion style, make up, hair style. So you need to take that into consideration when people age you later than what you are.
For what it's worth; please collect your grain of salt now; WII Sports aged me 25 years younger than I actually am, when I did it's programme evaluation study (My oh my!!!! How I love WII Sports) (Please excuse my out burst of vanity, while clutching at straws. After all I'm permitted to invoke my feminine discretion by not revealing such classified sensitive information LOL) Suffice to say; I was born in the previous millennium.
I firmly believe, and hold to the fact; you are as old as you feel. (Oh my lawd!! Stand aside Methuselah, Catherine is coming through. LOL)
Be safe, well and happy
Lotsa luv
Catherine