How old is too old to adopt a toddler?

[PetuniaPetunia]

I am sure this has been discussed before, but how old do you think is too old for a healthy couple to adopt a toddler?

I've read threads before asking how old is too old to have a baby (biological) and lots of people seem to think that over 30 is a bit old and over 40 is definitely too old and unfair to the child. But in adoption parents are often a bit older.

I am 47 and so is my partner; we adopted an 8 month old baby when we were 45 and did it again when we were 46. We are permanently exhausted, but I guess most parents of a one and a two year old are. We are also more patient and relaxed than we would have been had we have been younger.