WHAT SHOULD MY 40S SIGNATURE STYLE BE?/ TOPE AKWADA/ 15 JUNE

I'm searching for a style evolution to go along with my new age of life😊 even though my mom keeps telling me I'm not 40 yet!! My fashion has evolved overtime from being more tomboyish in my teens and 20s to casual and sometimes girly in my 30s. What therefore should my 40s signature style be?