It must be hard to hear (even though you’ve made clear you’re open to negative responses) but no, no way. My mum had me aged 42 and even then she was unable / unwilling to do anything energetic with me like playing tennis (despite being fairly fit and in good health). She found it hard to make friends with other school mums and was isolated as a result. She was ill-equipped for the kinds of pressures and risks that were relevant to me as a teen because home PCs hadn’t even been a thing when my sister (12 years older) was a teenager. She hasn’t chosen to offer any practical help as a grandparent because she’d find it too tiring.
There are lots of disclaimers to make here:
(1) I love her, she’s a great mum, she gave me so much and I had an amazing start in life.
(2) No one would bat an eyelid at a 42 year old mum today, even a first-time mum.
(3) Everyone is different: of course there are a ton of people doing triathlons in their 40s/50s/60s, grandparents caring for grandchildren into their 80s, etc. etc.
But this is my view. I’m 38 and have 3 children and I feel SO much older since having them. I’m fairly fit and healthy but my energy levels are poor, I need so much sleep to function, I can already feel my joints, skin, bladder function etc. declining. You couldn’t pay me to have another one in 10 years.
I wish you the very, very best if you decide to have one, but my hope is that you find what you’re looking for from something else.