Personally, my early-mid thirties were my best, healthiest, most active, most attractive years.
I had DC later though and the care-free element of having a career but no dependents certainly played a part in that, though I think it's true for many people in their 30s, who are comfortable with their life choices and in their own skin. The 20s can be too frenetic and fuelled by self-doubt (and other stuff that makes you look unhealthy) to be the best years, for many people.
So the good news for you is that it's still all to play for, in the sense that your potentially most healthy, settled, confident so attractive years, are still ahead.
You will get past the demanding pre-schooler years and things will settle down, you'll have a chance to get a bit of yourself back.
Mentally, self-confidence, knowing your own mind and following your own interests are very attractive qualities.
Physically, do not underestimate the power of oestrogen. It makes you feel good, look good and contributes towards muscular strength. So, you have the chance to fitter, healthier and more glowing than you have ever been, more vivacious, in the next decade.