that's not true at all, you need to be 21 or over, most of those who applied before the date the change was brought in should be ok, i've heard of one case up to now, where a 19yr old American was refused a spouse visa for being under 21 and they applied before the rule was brought in.. as its been 14wks i'm sure they are dragging it out, so by the time she gets her visa she will be 21, i'm wondering if an immigration officer could refuse her for being under 21 when she got to the uk, so maybe the embassy are making sure this doesn't happen ?
no news is good news in a funny way for you, at least they haven't refused you yet , just hold on