I had my first kid at age 34, and part of my deeply regrets not going sooner (wife is much younger). I had some serious health issues by 45, which impeded by ability to raise my kids the way I wanted.
Adopting in 40s? Will the parent even still be alive when the kid graduates college? With good luck, genes, and good diet/exercise, yes. Otherwise, likely not.
They often don’t even let you adopt at that age. I knew some 40+ yo families that adopted overseas due to age restrictions. One family adopted from China and one from Eastern Europe.
Life expectancy for a 40 year old in the US is ~80. It is very likely that with an average lifestyle the parents will be around after the child has graduated college.
Adopting in 40s? Will the parent even still be alive when the kid graduates college? With good luck, genes, and good diet/exercise, yes. Otherwise, likely not.