Jennifer Aniston went through her ''awkward phase'' in her 30s.

The 'Horrible Bosses' actress is getting ready to celebrate her 45th birthday next February and looking back over her life, she says her 30s - during which she was married to Brad Pitt for five years between 2000 and 2005 - were a strange time.

She told Parade magazine: ''There's nothing to worry about [getting older] - although I don't think I had a care in the world at 25, either. That all started in my 30s, my awkward phase. 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 body; I'm more in my mind. Life is full. Life is wonderful. We're very, very fortunate.''

Jennifer - who is now engaged to be married to actor Justin Theroux - enjoyed her best-known role in sitcom 'Friends', which also finished when she was in her 30s, and she still likes to occasionally watch clips from the show.

She added: ''I actually will always stop and watch, not for the whole thing, but usually because I've forgotten a lot of the episodes. It's sort of fun for a second, I'm like, 'What's this one?'

''And sometimes it comes back to me. I always know what year it was by what length my hair was or what colour.''