How do you play the sims 4 aging on or off ?

Always off. I don't even manually age up my sims except babies and sometimes toddlers. I like my sims to stay the same age forever.

only active household for my own sims but I leave aging on for townies most of the time

Ageing off usually and will age sims up manually when I want to.

I can't stand playing with ageing on for inactive played households because I don't like playing rotational much and then I might make them, and not really play them much, and then they die.

I normally play with aging off and just turn it on when I actually need sims to age up (as doing it manually leads to things getting weird in my experience, lol)

I think I'm the only one who never ages ANY sim ever. After years of playing I never even had a birthday. No one ever ages and my children have been children for years. I don't know why but whenever I want let's say a teen sim for example I just make one in cas or a new toddler etc. I am planning on having a birthday party for the first time ever lol

When I think about it I think it's because I just don't see the point of replacing one child with another when I can keep the same one. And I don't care about making generations or extended families. Though I do have grandparents I made.

How do you turn aging on or off?

Go into your options, then select Gameplay, there should be options on different ways your sims will age, choose if you want to show whims etc @Ianoart

I like to have the Sims I don't play age up, but keep all my families immortal lol.

Thank You Nikkih. Does it affect all Household? And what is your recommendation on whims? Can that be changed after? Appreciate your help

aging fully turn off as well as using a mod to fully stop aging and make my sims immortal