I know you have the Lizzie Higgins version from 1973 above, but I don't think you have this version yet from the Folk-Legacy Archives, recorded in 1958. Interestingly, although the tune is much the same in this version as in the later version, there are differences, including dips down low in 1973 in spots where they aren't in 1958, e.g., at the beginning. Also, lyrically, in 1973 she ends with "And cruel fate put an end to his growing."

https://www.youtube.com/watch?v=wswYFNon5hc

Oh father, dear father, pray what is this you've done?
You have wed me to a college boy, a boy is far too young
For he is only 16 years and I am 21
He's my bonny bonny boy and he's growing

As we were going through college when some boys were playing ball
When there I saw my own true love, the fairest of them all
When there I saw my own true love, the fairest of them all
He's my bonny bonny boy and he's growing

For at the age of 16 years he was a married man
And at the age of 17 the father of a son
But at the age of 21 he did become a man
But the green grass o'er his grave it was growing

I will buy my love some flannel, I will make my love's shroud
With every stitch I put in it, the tears will fall down
With every stitch I put in it, the tears will fall down
And that put an end to his growing