I always prefer to see the duration of days in the format of
_y, _m, _d
I find it more appealing and more informative.
So I wrote a formula for that
quotient(((DAYS(TODAY(), {Date}))*-1),365)&" y, "& rounddown(((mod(((DAYS(TODAY(), {Date}))*-1),365))/30),0)&" m, "& round((((((mod(((DAYS(TODAY(), {Date}))*-1),365))/30))-(rounddown(((mod(((DAYS(TODAY(), {Date}))*-1),365))/30),0)))*30),0)& " d"
I am no formula expert and I think there is a room for improvement. Please feel free to modify it and share the result!