I'm at the age where my fertility is on a downward trend, but I don't have any panics or pangs.
My husband and I have lots of reasons for not having children, but I've never been able to pin-point one thing. For me, it's the physical and mental toll that pregnancy, birth and the early years take. The relentless drudgery. The worry about their future [the declining environment, the cost of education, the likelihood of zero-hour contracts/never owning their own property]. The effect on our relationship.
We were once at a stage where we thought about trying a couple of years ago - I bought pre-conception vitamins, ovulation sticks. And all that happened is that I woke up in a blind panic each day thinking we were making a big mistake. Once I threw all the paraphernalia out, it was like a huge weight lifted and that nervous pit in my stomach disappeared.
I guess what it boils down to is that I don't want my life to change in the way that a child changes it. Out of friends who have had children, the ones who have struggled the most have been the ones who proclaimed, "Having a baby isn't going to change anything!" Okay, Jan. I've worked hard for my financial stability, my mental health, a good relationship, so in that way, no, I don't have any regrets.
Having a baby because you worry about regretting if you don't - it is a huge gamble. I'd rather regret not having them, than regret having them.