You cannot predict, how it will be or not.
My friend, had her 2nd baby, at 46 years old. Her Husband is the same age.
They are fine, the pregnancy was fine, the child is fine, they are fine.
Now, there are MANY older parents nowadays. In their 40's. This is common.
But, 'sometimes' people may think you are the "Grandparent" instead of the parent. But again, nowadays there are MANY older parents.
But for your partner, he is getting older. Hence, you need to think about if you can get pregnant. And if you want to be, then don't wait around. Because, his clock is ticking.
ANYONE can have aches and pains and being tired. That is what parenthood is.
You cannot have, 100% certainty, about anything.
But if you want a child together, then you gotta just start.
AND whenever a couple has a baby or child, your life WILL need to, adjust. It just is. It is NEVER the same as it was, before you had a child.
Life changes.
THAT is the bottom-line.
Once you have a baby, you cannot just live as you did, when you were single. Being a parent, demands change. FOR your child.
I don't know what you mean by your fear is bringing 'another' child into this world only to raise them as part-time single parents. Seems like you are already anticipating an end to the relationship??
You need to know, the status of your relationship and its cohesiveness.
And you seem ambivalent about the age difference. Because of the age.
You need to be sure of this, of having a baby or not.
AND with him, or not.
But again, you cannot predict... anything.
But you need to be certain, in your heart and mind.
You don't seem so sure.
I have 2 children who are 8 and 5. I am in my 40's. My Husband is younger than I am. HE NEVER EVER, had problems with me or that fact, ever. Per having children or marrying me or not.
I am not "old" nor slower nor handicapped nor physically unable.
MANY of my friends, are my age too. WITH young children. They are fine.
Even a 20 year old can have back pains and not bouncing back.
You seem ambivalent, about 'caring' for your aging Partner... as he gets older, and how you will handle that. And his viability....
But the both of you are not even married yet. Only talking about it.
You either know if you want to get married, or you don't know.
That is also, the bottom-line.