the babyface comment is a killer, i hav had this quite a lot in the past. what i found gets around this the best is too reply as if its a wiked compliment eg,
ill stroke my "babyface" with a broad smile and say
"omg really, u think i look young!! thanks hunni"
or
when she says it i'll smile widly and give her a big exstatic, really happy hug (kino eslcalation) saying;
"omg i love u! and i wasnt even fishing for a compliment

how old do u think i look then"
it seems like the responce some1 who is older will actually give. and will help keep alpha frame.
can then continue with some cocky funny if she is still not convinced
"its the magical moisturiser i use, im like 60 years old

keeps me looking young"
hope this helps