Hello Sancti,
I can't find any of your first lot, but among the second I have Wm Young (b c1816 Avondale) and wife Euphemia Leiper (b 1823 at Drumboy and christened in Avondale). I have no death dates, but William was still alive, age 85, and living as a retired farmer at Hill farm in Avondale, in 1901. Euphemia was alive in 1871 but I haven't checked '81 or '91. Are there any dates or other info legible on the stone?
I can't seem to get the right pairings for the other names.
John