Is AIA prime life worth keeping? Mum bought it when I was a newborn (1992) and only know about it today. Should I use it for retirement?

Agree with Elijah. Drop me a dm if you need more assistance with it.

You are holding this policy for 29 years, you are already on the steeper end of the compounding curve. Whatever premiums paid already paid, what you can do is request for an updated BI (benefits illustration) projection. Look at the projected increase of surrender value and calculate the ROI of that increase vs the annual premium you need to pay. This will be your annual return for investing your premium. Make your call on whether this return is worth keeping the policy.