My mom had me at 17, not ideal, but my grandma was 40 when I was born. It’s been awesome having her as a grandmother and she’s been like a second/main mother to me and yet; I would be sad if she was my mom because I am in my late 20’s and she is nearing her 70’s and the drastic decline in health, energy levels, and how rigid her and my grandpa are becoming now they are getting older is palpable. If I had kids today, my grandmother would be too old to properly help with childcare nor to provide remotely the same level of care I got to receive. I mean obviously in her case she is my grandma so she is YOUNG and expectations are completely different to those of a parent.
My mom also had one of my siblings at 42 (she is now under 5yo) and honestly while my mom is still fine overall, her health has also steadily declined, and being very honest my mom doesn’t have a health that makes her likely to be there in 30 years time, and I find it tragic. Similarly, my youngest sibling doesn’t have much of a relationship with the grandparents because they simply don’t have the capacity to look after her for long (I was always over at my grandparents house when little and always going on hikes and trips solo with them, etc…) and realistically speaking by the time my sibling is likely to have a kid (20+ years from now) my grandparents will likely be gone and my mom will be a similar age to my grandma now and likely honestly less physically able than her, based on her already reduced mobility.
Personally I find it super sad because I did get to know my mom young and my grandparents in their 40’s and I do know what my sibling has and will continue to miss out on and I am already pre-grieving the approaching death of my grandparents (even if it’s likely in 15+ years) and I just couldn’t imagine being my age and worrying about this about my own mother. Like if my mom was to die at 80 (and I’ll be shocked if she is still around then) I’ll have known her 63 years, I’ll be on the verge of retirement myself and it will be an appropriate age to navigate the loss of a parent, my sibling would be 38 ! It’s so young! It’s that time of life where if my sibling has kids they would be likely to be young and need motherly advice, but at 80 my mom would likely need care herself vs actually be able to provide any, let alone a very active grandmother relationship with her great kids (something she is likely to be able to provide better to us, older siblings).
idk when I think of my youngest sibling I get sad. Currently my mom is still in decent (even if not great) health and my sibling currently technically has a better version of my mother than I did. BUT in the end this sibling will have to face so much more losses early on and simply won’t get the same childhood with grandparents I had or the same adult relationship with our mother I have had.