I hear you, silverlining47! But another way of looking at this is that there's something "young" about first becoming a GM when other people you know are already GGMs. You're first beginning an experience they've already put behind them. If that doesn't make you feel like a spring chicken, IDK what will, LOL!
Ok, maybe "spring chicken' is an exaggeration. But my point is that you could look at this as if you're having a "younger" experience, and so, perhaps feel younger.
I'm not sure what this has to do w/ your living in France. Are you concerned that you don't live near enough to be an "active GM?"
Regardless, lots of GPs today live far from their GC, and it's not always b/c of age or retirement. Sometimes it's b/c one of the parents got a better job somewhere else, etc. And often, as you may know, the GPs remain in touch via skype, FaceTime, etc.
Also, as you can see, having children later is becoming more and more common. In fact, your DD is a "young mum" compared to some of the first-time mums today.
Wishing her an easy pregnancy and a healthy, happy baby!