Hi GG,
Until 5 years ago, when my youngest was born, I had been a foster carer for quite a number of years.
It started when I was in my twenties, and not ready for children of my own, but wanting to give back to the community - and basically that I like kids.
We did respite care - taking a little girl for one weekend a month, to give her single father a break. There were other issues with her family too. We also fostered a baby once when her mum was in jail.
The little girl we had regularly ended up moving into a full time foster home shortly after I had my last child, so the need for our respite care stopped, and we weren't in the situation then to take in any more kids.
It is not the same as having your own children. We loved the little girl we fostered, but nothing like the way we love our own children. Still, it was difficult to see her in a situation that we couldn't control (when she wasn't in our care) and we often wonder how she turned out.
Fostering can be difficult, but it is also very rewarding. I wouldn't like to take on teenagers though, but that's just me.
Good luck with your decision.
Caroline