I think men that age can definitely have a romantic idea of their legacy in a child.
Sadly the reality at 50 is often vastly different and it is the women who bear the huge cost of childcare, salary and pension being hit.
Obviously existing children are hugely negatively impacted if their mother is suddenly responsible for paying for childcare to continue working.
Too many women are beggered by having children with men, even professional women with careers.
Children are very expensive.
Are you thinking of marriage?
Has he offered it?
It is absolutely batshit to consider having a child with a man that isn't absolutely committed to marriage, sharing assets etc.
Have you met his family?
Threads upon threads about the hugely negative impact on the first child being treated as less than by the new partner and his family.
They often do not see the mothers child as family and it can have really profound negative affects on them.
What are his family like?
Often women have no idea of this until the new baby arrives and they want family photos, outings, weddings with only the blood child included.
If you care for your child you will think long and hard before you blow up their lives.
I would get her a kitten and keep what you have safe.
The fact he is leaving it up to you means he is only reasonably committed to the idea which is fine.
What would you do if when pregnant he changed his mind?
All of these scenarios are real and have left women screwed.
Protect what you have is my advice.
Also do a detailed worst case scenario cost analysis of what a child would cost YOU.
Mat leave, childcare if he left, exactly what his child maintenance would be if he walked away.
The number of women on MN genuinely stunned at how little men have to pay, and how they might see a baby once a fortnight, if at all, is astounding.
This is always a possibility.
Women carry the cost of children and therefore must do their due diligence before even considering it.
Sadly many don't and find out the hard way.