Dh and I were both 29 when I got pregnant with dd and had been married for 4.5 years, but still my in-laws INSIST that dd was a mistake, even to this day and she is 3.5!! She was very much planned, but we were both in graduate school at the time, so they assumed that we were being irresponsible.
The best response though, to our announcement that we were expecting was from my mother-in-law, who said to my dh "how can you have baby, you don't even have a cd player that works properly!" We had a radio with a 5-cd changer that broke during a move, and suddenly that was the barometer for parental readiness!! Guess what we got when the baby arrived? A new radio!
I love my in-laws, can't you tell?
Anyway, we haven't told them about this pregnancy yet (I am 10 weeks) and we are dreading the litany of responses. I am now in a PhD program and I am sure they will tisk tisk us once again. But you know, at the end of the day, it doesn't matter. What matters is that your dc knows how loved he/she is, despite the rumblings of those around.