I let unplayed Sims age up but there are some Sims i don't want to age up at all. You can use MCC to flag Sims one by one but i wanted to be able to add/remove a No Aging Trait easier. So i added a Pie Menu to Computer/Tablets where the No Aging Trait can be added/removed to Sims (mind. Age Toddler)
This is a hidden lot modifier – which means it won't take up one of the user-facing lot traits you can choose. All you need to do is simply place it on your lot and the ‘Kiss of Fresh' modifier is applied to all the consumables & flower arrangements on that lot!