Do it now. Start tonight. Don’t necessarily try for a baby, just stop using contraception.
Being a parent is a job for the young, at any rate not for the old.
I don’t know anyone with kids who has regretted it (except perhaps one with a handicapped child)
But at 60+ I do know a number of childless couples who get teary when drunk, about how they wish they’d had them and how they made the wrong decisions in their 30s to have “fun” instead. In the scheme of things, that “fun” pales into insignificance beside the joys & terrors of children.