Leonardo Dicaprio constantly reassesses his life.

The 'Django Unchained' star insists the thought of turning 40 in November 2014 doesn't concern him as he is only thinking about continuing to do ''great work'', and feels he can do that by regularly reviewing his goals.

Speaking to August Man magazine, he said: ''I guess the big four-o hasn't entered my consciousness yet.

''I believe it's very important to look back on the choices you've made and re-analyse where you want your life to go and the things you want to do as an individual.

''My goal is to keep doing great work ... I haven't stopped yet and hopefully the work will never stop.''

Leonardo - who recently announced he is planning a lengthy break from acting and will use the time to focus on his environmental work - enjoys his endeavours in trying to help the planet, and finds his experiences ''gratifying and fulfilling''.

He added: ''In my adult life, my environmental work and activism remain a priority.

''I created a foundation that focuses on raising public awareness of the very important issues concerning our planet, our environment, and the impact we as people have on the world we live in.

''It is not only an extremely fulfilling and gratifying learning experience, but has also taken me to some of the most interesting and beautiful places in the world.''

Despite his plans for a break, the 38-year-old actor is still passionate about his career and loves the ''challenge and excitement'' of making movies.

He continued: ''Once I got my first opportunity to work on a movie, it's really been a mad rush to fulfill that dream.

''As an actor, I do everything possible to tell a great story in a truly artistic way, but at the end of the day you never know how critics and audiences are going to respond.

''It's always an eternal sort of mystery in making movies, and that's the great fun, challenge, and excitement about doing what I do.''