I adore Jess Greenberg!  Her songs are awesome!
I do too! I've loved her since she started performing in her childhood.
How old is she?  She looks quite young!
She must be around 23 years old, since she began recording songs on Youtube in 2010 at age 15.
I did hear that she is on youtube, but I haven't actually looked for her videos yet.
I highly implore you to do so. Two years after she started posting, she won "Female Artist of the Month" on "Star Central"'s (a magazine) website!