Sims can retire at level 16, but only if you want them to. Your Sims will let you know when they are ready to retire.When your Sims retire, they will leave behind an Heirloom for your other Sims. These Heirlooms can be used to earn new traits, career levels, and hobbies. You can also purchase Heirlooms in the store.Have duplicate Heirlooms? You can sell them to get more Heirloom Tickets..But I’ll miss my Sims when they retire!They won’t be gone! They’ll still hang around your lot so you can interact with them, but they just become non-playable characters (NPCs).Your Sims can also be mentored by retired Sims so they can earn career and hobby XP. .And when they retire, you’ll get Heirlooms from them that will help you unlock more things to do in the game. It’s a win-win all around!Passing on an HeirloomWhen you get an Heirloom after retirement, you’ll be taken to the Heirloom screen in the store. Here you can:open the Retirement Chests that your retired Sim gave youpurchase three chests with different tickets: Heirloom Tickets, Super Heirloom Tickets, and Luxe Heirloom Ticketsearn free Family Chests every 20 hours that include rewards, like Tickets. . Sims will stay fully grown adult once you created them. They will not grow old like us. They are not aging for each day or year they have existed in your game.. Learn all about the aging process and how to retire your Sims to get Heirlooms and earn rewards in The Sims Mobile..