I've been changing Tish's appearance back and forth while I make screenshots for Dragonborn: Beginnings.

For the younger version of Tish I scaled back her weight to 40, removed her tattoos and used the Fair Skin texture. I also gave her a long pony tail Result she looks early 20s.

Tish the Milf weight is set to 100 making her a lot more curvy, She has her Suicide Girl tats and shorter her hair. I use Mature Skin (medium) for her which gives her more prominent nipples and pubic hair. Result...MILF in her mid 30s.