Can tulpae progressively age?

[Black Bane]

Not in bursts like elise did.

[Zornia]

Its possible... they could deviate form to look older.

[Phi]

Possible, but it would be one of the harder things to do. Imagine trying to visualize a flower growing at an actual pace. It's so slow that you can't tell the difference between any two consecutive moments.

It would be easier to just have a burst on the tulpa's birthday or something.

[glitchthe3rd]

Yes, though as others have said it's more difficult.