How to enable Tracking on Apple ID despite age?

Hello finley886,

Please verify your Apple ID's birthdate is updated - Update the birth date associated with your Apple ID - Apple Support.

If you can't turn on the "Allow Apps to Request to Track" setting

In some circumstances, the "Allow Apps to Request to Track" setting can't be turned on, including: 

• For users with child accounts or who are under age 18 by birth year, signed in with their Apple ID*
• If your Apple ID is managed by an educational or business institution
• If your device is managed and uses a configuration profile that limits tracking
• If your Apple ID was created in the last 3 days

Do you fall into any of the other categories?

I wouldn't recommend having tracking on either though. This is an invasion of your privacy and apps will be able to track your activity across other companies’ apps and websites for the purposes of advertising or sharing with data brokers.