I'm sorry if this has been asked before, I've searched and didn't find what I needed so here goes:
Every time I install default skins, they are fine until my sims age into elder. I have tried using different sets of default skins but it happens with all of them. I have taken all other default skins (vampire, plantsim, werewolf) to see if that was the problem and it still happens. Any help will be useful, thanks!

Games I have: Sims 2 base, Nightlife, Freetime, Bon Voyage, Open For Business, Seasons
Stuff Packs: TSS, H&M Fashion

EDIT
See attached pic for dark default, he is not wearing a shirt, only one that happens with. Found while fiddling around trying to find the problem