Calculate dob and print as Year, month and date Like (29 years 8 months 24 days). and is there any way to vadidate normal text box as mm/dd/yyyy ?
Try searching the forums. This issue was discussed here many times in the past, including code samples.
Try looking for "age calculation".
And there's no need to validate a field (although that's possible). Just set its Format to Date and specify that pattern.