Hi, I don't know if Vic is different, but my friends parents fostered children. I'm not sure if their DD's age had any affect, but all the children they took in were older than their DD.
They took in teens as most foster carers prefer younger children. Under 5. They did have one little special needs boy who was 5.
I know 2 others, all are different ages & all have children of different ages. My friends parents were over 40 & had their oldest DD pass at 14 the year before they started.
Another ended up as a single parent of her 2 plus the 5 she fostered, but the kids all stayed with her still til their parents decided they were ready to have them back. The other had a 6 month old baby when she started & the little boy she has is older than her baby DD.