I do agree with the "age of reason thinking" for the matter of salvation is not of work but belief. In order for one to be a believer, there must be certain cognitive development and awareness made of sin, righteousness, and judgment.Humans who refuse to spend time observing, observing, observing before interpreting and going with what others taught them...yes. Humans who practice inductive Bible study, no.
Most people are ignorant of inductive Bible study and lean hard upon their church traditions.
An example of this is the argument that there is an "age of reason" for children. There is no biblical support for such a thing, but churches teach it anyway.
So much of the nuanced arguments of ivory tower thinkers are just unuseful attempts to pridefully make a useless point.
So, Just as Christ said, the kingdom of heaven is made up of the people who come to him as little children without some agenda, I have no problem with those who have no concept nor ability of understanding being in such a condition as Christ accepting them.
Now, at what level of maturation and cognitive development is necessary, I don't put any restriction. For it is the work of the Holy Spirit to convict of sin, righteousness, and judgment.
I have no business considering some "work" needing to be involved.
What the OT taught was that after 8 days there should be some temple pronouncement. But, imo, such was not a matter of salvation but of dedication.
I have no water to carry for those in the need of baby baptism thinking that some salvation is granted, but neither do I consider that those not knowing they have been born are condemned.