I am 21 now, I learned Spanish and Portuguese about a year ago, and most languages earlier.
Link to wiki for more info: http://en.wikipedia.org/wiki/Pimsleur_method
On the other hand, I think both methods can get at the same aim: massive memorization of both new material and the natural use of patterns.
When we learn a language "from birth" (of course it is more of a 6-year full-time immersion program, which isn't all that amazing in itself than something that happens the day you're born) do we learn the patterns without realizing, or do we literally have to memorize each new adjective ending for nouns in different cases and genders (eg, in German)?
I assume our brains pick up on the patterns, hence why kids make cute mistakes like "I'm the goodest". BUT, as an adult, why not just learn the pattern explicitly AND listen to and participate in lots of conversations AND memorize a lot?
They ALL help. Do as much as you can as often as you can and your learn will spiral out of control awesome ;-)
EDIT: I'm also not sure whether only-memorization to learn patterns works or not. When people say they're "conversational" in 3 months, how much can they achieve in 3 more months? It's a question of whether memorization or whatever process they're using is exponentially scaling. I think that most grammer patterns can be made clear with 3-50 examples, so in the end that doesn't seem that difficult. But I've only had experience memorizing grammer first, with the help of hundreds of examples at the same time, and then producing hundreds of examples myself to become fluid.
Anyway, watch the movie, and pause it whenever something comes up that you don't understand. You can also try watching English movies with French subtitles but it doesn't develop your French ear. Also Google Translate is good practice. Write something in one language and translate back and forth--it does a pretty decent job. Writing in French will force you to use the proper grammer and vocabulary to make the translation come out OK.
I've in my mid 30's and have learned French fluently and advanced Spanish in the past 6 years. Aside from being immersed in the language, finding a girlfriend definitely helps... :)
Finally Meetup.com and Couchsurfing.org can be good resources to meet locals (of both sexes...).
Good luck!
I'm not sure of the reason behind this, but there are also often minor differences in the English audio and subtitles of films, even when the film was originally recorded in English.
The best thing, imo, about this system is that you can forget about it for a month and then, when you try it again, you get back into it in no time. It definitely seems to have the edge over other systems I've tried in getting things into your permanent and automatic memory.
(what does "conversational" even mean? that you've memorized common stranger-conversations, or that you know how to conjugate all present tense verb forms?)
> I'm trying to learn French and it still sucks, after
> almost 3 months in Paris (but not much social contact,
> admittedly, as I came here without knowing any people).
Well get to know some people! Drop by my office in Suresnes :)