How to Subtract days or years from new java.text.SimpleDateFormat

I could swear this worked at one time where I use the below:

${=(new java.text.SimpleDateFormat("yyyy-MM-dd")).format( new Date() )}

To Subtract or Add I would add enclose the -# or +# like so:

${=${=(new java.text.SimpleDateFormat("yyyy-MM-dd")).format( new Date() )}-1

The result of the -1 is showing up as 1982

QUESTIONS: 1. Why is it taking away the -MM-dd part? 2. Why is it subtracting 23 years for -1

GOAL: To be able to subtract from sysdate and the request show in yyyy-MM-dd format i.e. if I want someone to be 65 years old - i want to subtract from sysdate to get that.

Again this is an xml tag I'm populating the expression in.

Thank you,

Rob