Limiting entries to only two numbers

Hi There!
I want to ask people about their age and want them to be able to enter only two numbers such as 12 or 56 or 30 or 99. How do I do that?

type integer with constraint . > 9 and . < 100

1 Like

Thanks. Please where do I type it?

Would you mind to read some basic introduction articles in the help center, please, e.g.