How old are Joe Jonas and Demi Lovato?

Demi Lovato is 16 Joe Jonas is 19
I Think Joe Jonas Would Have been 20 years old and

Demi Lovato Would Have Been 17-18 years old

:D.........
joe is 21 born August 15, 1989 and demi is 18 born August 20, 1992

Joe Jonas and Demi Lovato birthdays are both in August. Demi's birthday is August 20, 1992 ,she is 17. Joe's birthday is August 15, 1989 , he is 20.