I do think age is much harder to define than race, perhaps that is because perceived age is dependent to a large degree on the texture used which is also dependant on the lighting.

There are other cues, which can be very subjective, such as fashion and hair style.  My present aim is to make my character appear to be late thirties to early forties but I am amazed at how a particular hair style changes the appearance.   Before I purchase anything for this particular character I try to look at real life images of similar aged people.  In many cases I do not buy the item but that is usually because it would look too young.  Very rarely do I not buy becuase it would make the character look too old.

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.