Convert an integer to # of years-months-days

I need to convert a whole number to the number of years, days and months.
Example: 4142= 11 years, 4, months and 4 days (give or take a day)

in my text box i have a

=avg(Fields!XXX.value)

so i want to convert inside my expression..is there anyways to do that..i mean to do 2 calculation at a time in my expression?

thanks in advance