The 44-year-old actress, who married Pitt at the age of 31 in 2000 and got separated in 2006, is more carefree now, reported E!Online.
"That there's nothing to worry about -- although I don't think I had a care in the world at 25, either. That all started in my 30s, my awkward phase," Aniston said.
"I'm a little bit of a late bloomer! But it doesn't matter to me because it just gets better. They do say youth is wasted on the young, but I feel just as youthful now, if not more, than I did when I was 25. I'm more in my mind. Life is full. Life is wonderful. We're very, very fortunate," she added.
While Aniston said she is more than happier with fiance Justin Theroux.