I couldn't read and run. Firstly, at 35, you're not "older". I was honestly expecting you to say you were in your 50s! I'm 38, and I swear my friends and I look far better in our mid-late 30s than we did in our 20s, because we've found our style and confidence. Sure, teens and 20-somethings are objectively attractive because they have good skin and less cellulite, but that's pretty much it!
Second, I was expecting you to be older than your husband, but it turns out he's the one staring down the barrel of 40. He's full of shit with the whole "men age better than women" thing - my DH has the same crows feet and salt and pepper hair as me. It's an old trope used by marketers of beauty products to convince women to spend money by convincing them they lose attractiveness as they age. Don't get me wrong, I'm buying into all the products! But I don't for one minute think my partner is ageing better, he's just lucky enough to be a man, so society ALLOWS him to show his age.
Also as PPs have said, when you age together, what you find attractive will (or should) adapt with it. When I look at photos of DH when we first got together in our 20s, my mind sees a baby, I don't ever think he looks hotter then than he does now. Because my attraction is relative to our age. To be honest I'd be very concerned that your DH is making comments about women being more attractive when they're younger and I'd be questioning if he's having a mid life crisis and hankering after a younger model (which is just icky).
Lastly, you're pregnant and he should be in absolute awe of you and what your body is doing. I'm also pregnant (and "older", lol) and I swear this is the most attracted DH has been to me in ages. We're not currently sexually active, my libido's sadly vanished in pregnancy, but he's been the most affectionate I've seen him in years. And to be frank it's the least a man should be like when his wife putting her body through it to give him a child. Any man who doesn't show respect and support to his pregnant partner is, as PP 1 concisely put it, a cunt.
You are still young, your body is amazing and you deserve to feel better than this OP.