Well the person that did this age progression hit the nail on the head, didn't she?

https://mysteryu.com/wp-content/uploads/2016/09/aric.jpg
I dont see any reason why age should enter into it, once the changes from babyhood/infancy into adulthood have taken place .... unless there has been some dreadful illness /accident altering the face
OMO. I am not an expert, but I do have an unusually keen eye.
It's not an exact science but it can sometimes be reasonably accurate when compared with the person in life when they are discovered.
Apparently the parents of the missing sometimes take great comfort from an age progressed image of their lost one; something I find very poignant as it is all they have of them.
In Madeleine's case they used predominately photographs of Kate and Gerry and also of their close relatives for family characteristics while taking into consideration the ageing process in bone development.
So although not an exact science if there is enough information available, the results have sometimes proved quite startling on those occasions they can be confirmed ... and at least it is a starting point which is better than nothing in my opinion.
Apparently a photograph of Cristiano Ronaldo's maternal grandmother has gone viral because people say he is the image of her (I don't see it myself) but it confirms family resemblance can be an influential factor.