Hey @Abhraroy!
Congratulations on completing the challenge!
For animating the counter of the age you can use the method explained in this article Animating Number Counters.
As for the validation, the app shouldn't allow to enter 0 or letters in the fields.
Also for better user experience, remove the red color from the labels (as in the design file) if there is no error.
I hope you find this helpful! Cheers 🍭