While there are many cultural ideas that late teens and early twenties would be 'biologically best', data does not bear this out. 16-19 year old mothers are in the second highest group for risks including lifelong disability and death from pregnancy and childbirth related causes. Our physical adolescent development takes much longer than cultures like to acknowledge. Different risk factors vary and there are other factors that age for an individual, but mid twenties to early thirties has far better outcomes, particular in health, for mother and child.
Surely the more urgent problem with the set-up is parenting your children through GCSEs whilst simultaneously physically and emotionally supporting your parents with dementia/home carers to co-ordinate, not that the grandparents can't babysit?
Potentially more urgent; however, for maternal wellbeing, there is a significant impact in not having a family support network. This has not only grown due to the rising age of having children, but also has culture moved to more nuclear families over multigenerational living and times as there have been recently where many are pushed to move away from their families to find work and afford living.
My family are not safe to have around my kids. I ended up very isolated and definitely felt the lack when I've seen those I know who can just pick up the phone and have their mum's ear, even if just to listen. Help is more than babysitting, it's having that wider support. Human pregnancies are one the most physically demanding, our infants as much, there is a strong argument that menopause was partially for the benefit of the 'grandmother effect'.
Should we be encouraging young women in their early to mid twenties to have children when they may not be financially secure or with the right partner to have children just because biologically they are at the best age for pregnancy and childbirth?
I agree that there far more risks and benefits to consider than age, but I also think there may be benefits as a culture to push for relationships and community including how to be and find good partners to be a higher priority than careers and to possibly put that focus first. It actually really frustrates me when talking with school senior leaders who go on about preparing their kids for the future and life, that they only mean careers. I get a deer in headlights look when I ask how they're being prepared beyond that.
I literally have had one when discussing their PSHE curriculum tell me that teaching kids all the bad things about relationships - signs of abuse to gangs - was enough so kids would know how to find a good relationship. They dedicate a half term every year to career, but healthy relationships get one week in one year group at a time of year where PSHE is often pushed aside for mocks, and was still more focused on unhealthy ones. It's ridiculous, we're a social species, we've had reports for years on how more and more people feel lonely and the impacts of isolation, and yet culturally it's pushing more towards dismissing and fearing relationships more than anything.