| 0 | This Wikimedian is 0 years, 0 months, and 0 days old. |
Input your date or birth into the template, like so:
{{User current age|day=16|month=08|year=1982}}
which produces:
| 41 | This Wikimedian is 41 years, 8 months, and 0 days old. |
The userbox, with your current age.