Just because your kids are old enough to have kids doesn't make you old! My baby sister Debbie is a 47-year-old grandma and she is SO stylish.
True story: a friend of Debbie's was trying on a new look and her 16-year-old daughter said, "Mom, who do you think you are, DEBBIE ROGERS?"
My oldest friend recently had her FIRST baby at 50. She thinks of herself as a hip young mom.
It is very possible to be hip *and* age-appropriate. You are definitely going in the right direction. It will be fun!