Scale particles over their individual lifetimes

[syaped]

I know this must be relatively simple but I can't figure it out...

I spawn a burst of particles which are deleted between 40-80 frames by a Delete Operator. How can I have those particles grow in scale from 0% at birth, 100% halfway through their lifetimes and then 0% at deletion?

If anyone's willing to share a simple scene example it'd be much appreciated!

[localexistence]

Add a Scale Operator – Set it to control particle size.
Use a Float Curve – Set the scale to 0% at birth, 100% at the midpoint, and 0% at the end.
Use Age or Normalized Age – In the Scale Operator, drive the float curve using particle age or normalized age (0 at birth, 1 at death).
Delete Operator – Ensure deletion occurs between frames 40-80.