Demographics is not my speciality, but I think I saw that the big bump in male population in China occurred some time ago. We might worry a bit more if China had an overabundance of men age 18-24, but I don't think that's the case. I think China has an overabundance of men in their 30's. That would appear to be somewhat less threatening.
Of course, if I'm wrong, I'm sure someone will come by and correct me.